I too keep hitting this bug on a Gigabit NUC i3, 4GB RAM and also on a Fujitsu laptop i3, 4GB, both with xubuntu 20.04,
when editing perl files of about 500 lines.
The files can be on local storage or a NAS.
I did think it was misbehaving with pastes (^V) but yesterday I had this:

Load Chrome and do a google search.
geany autobackup.pl
I ONLY selected a position in the file, deleted 4 characters and then saved ^s and quit ^q.
The perl compiler then glitched because there were 4 or 5 copies of the google search text sprinkled throughout the code.
I think this exonerates the paste operation and I think hardware too.
I have tried to see whether the load or the save is the culprit but unfortunately, reproducing the fault is difficult.
Here is some diagnostic infofrom the laptop but if more is needed please ask.
Phil

phil@phil-LIFEBOOK-AH532:$ uname -srvmio
Linux 5.15.0-41-generic #4420.04.1-Ubuntu SMP Fri Jun 24 13:27:29 UTC 2022 x86_64 x86_64 GNU/Linux

phil@phil-LIFEBOOK-AH532:~$ geany -V
geany 1.36 (built on 2020-03-22 with GTK 3.24.14, GLib 2.64.1)

phil@phil-LIFEBOOK-AH532:~$ geany -v
Geany-INFO: 18:49:45.238: Geany 1.36, en_GB.UTF-8
Geany-INFO: 18:49:45.238: GTK 3.24.20, GLib 2.64.6
Geany-INFO: 18:49:45.238: System data dir: /usr/share/geany
Geany-INFO: 18:49:45.238: User config dir: /home/phil/.config/geany
(geany:1857): GLib-GIO-DEBUG: 18:49:45.249: _g_io_module_get_default: Found default implementation gvfs (GDaemonVfs) for ‘gio-vfs’
Geany-INFO: 18:49:45.469: Loaded GTK+ CSS theme '/usr/share/geany/geany.css'
Geany-INFO: 18:49:45.470: Loaded GTK+ CSS theme '/usr/share/geany/geany-3.20.css'
Geany-INFO: 18:49:45.477: System plugin path: /usr/lib/x86_64-linux-gnu/geany
Geany-INFO: 18:49:45.489: Added filetype Scala (61).
Geany-INFO: 18:49:45.489: Added filetype CUDA (62).
Geany-INFO: 18:49:45.489: Added filetype Swift (63).
Geany-INFO: 18:49:45.489: Added filetype Graphviz (64).
Geany-INFO: 18:49:45.489: Added filetype Groovy (65).
Geany-INFO: 18:49:45.489: Added filetype Nim (66).
Geany-INFO: 18:49:45.489: Added filetype Clojure (67).
Geany-INFO: 18:49:45.489: Added filetype Cython (68).
Geany-INFO: 18:49:45.489: Added filetype Genie (69).
Geany-INFO: 18:49:45.489: Added filetype JSON (70).
Geany-INFO: 18:49:45.489: Added filetype TypeScript (71).
Geany-INFO: 18:49:45.489: Added filetype Arduino (72).
Geany-INFO: 18:49:45.489: Added filetype Kotlin (73).
Geany-INFO: 18:49:45.507: Loaded libvte from libvte-2.91.so.0
Geany-INFO: 18:49:45.565: /home/phil/geanybug/autobackup.pl : Perl (UTF-8)
Geany-INFO: 18:49:48.322: Quitting...

phil@phil-LIFEBOOK-AH532:$ cat /home/phil/.config/geany/geany.conf
[geany]
default_open_path=
cmdline_new_files=true
notebook_double_click_hides_widgets=false
tab_close_switch_to_mru=false
tab_pos_sidebar=2
sidebar_pos=0
symbols_sort_mode=0
msgwin_orientation=1
highlighting_invert_all=false
pref_main_search_use_current_word=true
check_detect_indent=false
detect_indent_width=false
use_tab_to_indent=true
pref_editor_tab_width=4
indent_mode=2
indent_type=1
virtualspace=1
autocomplete_doc_words=false
completion_drops_rest_of_word=false
autocompletion_max_entries=30
autocompletion_update_freq=250
color_scheme=
scroll_lines_around_cursor=0
mru_length=10
disk_check_timeout=30
show_editor_scrollbars=true
brace_match_ltgt=false
use_gtk_word_boundaries=true
complete_snippets_whilst_editing=false
indent_hard_tab_width=8
editor_ime_interaction=0
use_atomic_file_saving=false
gio_unsafe_save_backup=false
use_gio_unsafe_file_saving=true
keep_edit_history_on_reload=true
show_keep_edit_history_on_reload_msg=true
reload_clean_doc_on_file_change=false
extract_filetype_regex=-\-\s([^\\s]+)\s*-\*-
allow_always_save=false
find_selection_type=0
replace_and_find_by_default=true
show_symbol_list_expanders=true
compiler_tab_autoscroll=true
statusbar_template=line: %l / %L col: %c sel: %s %w %t %mmode: %M encoding: %e filetype: %f scope: %S
new_document_after_close=false
msgwin_status_visible=true
msgwin_compiler_visible=true
msgwin_messages_visible=true
msgwin_scribble_visible=true
documents_show_paths=true
sidebar_page=0
pref_main_load_session=true
pref_main_project_session=true
pref_main_project_file_in_basedir=false
pref_main_save_winpos=true
pref_main_save_wingeom=true
pref_main_confirm_exit=false
pref_main_suppress_status_messages=false
switch_msgwin_pages=false
beep_on_errors=true
auto_focus=false
sidebar_symbol_visible=true
sidebar_openfiles_visible=true
editor_font=Monospace 10
tagbar_font=Sans 9
msgwin_font=Monospace 9
show_notebook_tabs=true
show_tab_cross=true
tab_order_ltr=true
tab_order_beside=false
tab_pos_editor=2
tab_pos_msgwin=0
use_native_windows_dialogs=false
show_indent_guide=false
show_white_space=false
show_line_endings=false
show_markers_margin=true
show_linenumber_margin=true
long_line_enabled=true
long_line_type=0
long_line_column=72
long_line_color=#C2EBC2
symbolcompletion_max_height=10
symbolcompletion_min_chars=4
use_folding=true
unfold_all_children=false
use_indicators=true
line_wrapping=false
auto_close_xml_tags=true
complete_snippets=true
auto_complete_symbols=true
pref_editor_disable_dnd=false
pref_editor_smart_home_key=true
pref_editor_newline_strip=false
line_break_column=72
auto_continue_multiline=true
comment_toggle_mark=
scroll_stop_at_last_line=true
autoclose_chars=0
pref_editor_default_new_encoding=UTF-8
pref_editor_default_open_encoding=none
default_eol_character=2
pref_editor_new_line=true
pref_editor_ensure_convert_line_endings=false
pref_editor_replace_tabs=false
pref_editor_trail_space=false
pref_toolbar_show=true
pref_toolbar_append_to_menu=false
pref_toolbar_use_gtk_default_style=true
pref_toolbar_use_gtk_default_icon=true
pref_toolbar_icon_style=0
pref_toolbar_icon_size=0
pref_template_developer=phil
pref_template_company=
pref_template_mail=phil@phil-LIFEBOOK-AH532
pref_template_initial=p
pref_template_version=1.0
pref_template_year=%Y
pref_template_date=%Y-%m-%d
pref_template_datetime=%d.%m.%Y %H:%M:%S %Z
context_action_cmd=
sidebar_visible=true
statusbar_visible=true
msgwindow_visible=true
fullscreen=false
scribble_text=Type here what you want, use it as a notice/scratch board
scribble_pos=57
treeview_position=156
msgwindow_position=611
geometry=0;25;1366;719;1;
custom_date_format=

[build-menu]
number_ft_menu_items=0
number_non_ft_menu_items=0
number_exec_menu_items=0

[search]
pref_search_hide_find_dialog=false
pref_search_always_wrap=false
pref_search_current_file_dir=true
find_all_expanded=false
replace_all_expanded=false
position_find_x=561
position_find_y=455
position_replace_x=417
position_replace_y=286
position_fif_x=-1
position_fif_y=-1
fif_regexp=false
fif_case_sensitive=true
fif_match_whole_word=false
fif_invert_results=false
fif_recursive=false
fif_extra_options=
fif_use_extra_options=false
fif_files=
fif_files_mode=0
find_regexp=false
find_regexp_multiline=false
find_case_sensitive=false
find_escape_sequences=false
find_match_whole_word=false
find_match_word_start=false
find_close_dialog=true
replace_regexp=false
replace_regexp_multiline=false
replace_case_sensitive=false
replace_escape_sequences=false
replace_match_whole_word=false
replace_match_word_start=false
replace_search_backwards=false
replace_close_dialog=true

[plugins]
load_plugins=true
custom_plugin_path=
active_plugins=;

[VTE]
send_cmd_prefix=
send_selection_unsafe=false
load_vte=true
font=Monospace 10
scroll_on_key=true
scroll_on_out=true
enable_bash_keys=true
ignore_menu_bar_accel=false
follow_path=false
run_in_vte=false
skip_run_script=false
cursor_blinks=false
scrollback_lines=500
shell=/bin/bash
colour_fore=#FFFFFF
colour_back=#000000
last_dir=/home/phil

[tools]
terminal_cmd=x-terminal-emulator -e "/bin/sh %c"
browser_cmd=sensible-browser
grep_cmd=grep

[printing]
print_cmd=lpr '%f'
use_gtk_printing=true
print_line_numbers=true
print_page_numbers=true
print_page_header=true
page_header_basename=false
page_header_datefmt=%c

[project]
session_file=
project_file_path=/home/phil/projects

[files]
recent_files=/home/phil/geanybug/report;/home/phil/geanybug/autobackup.pl;/home/phil/newapi/scan_database.pm;/home/phil/newapi/apicommebt;/home/phil/forum;/home/phil/recfilm/film.pl;/home/phil/remotetrigger/dst.pl;/etc/perl/scan_database.pm;/home/phil/newapi/wikibit;/home/phil/newapi/chedit2.pl;
recent_projects=
current_page=1
FILE_NAME_0=211;Perl;0;EUTF-8;1;1;0;%2Fhome%2Fphil%2Fgeanybug%2Fautobackup.pl;0;4
FILE_NAME_1=1827;None;0;EUTF-8;1;1;0;%2Fhome%2Fphil%2Fgeanybug%2Freport;0;4

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