Is that with or without the changes of https://github.com/geany/geany/issues/3271#issuecomment-1236382367?
without the changes
I doubt that the plugins will have any effect.
I could reproduce 1 and 2 every time with the plugin Geany Preview and two lua-scripts.
Thanks to @xiota, but please keep using the Geany made from the tarball, you can make changes to that.
OK.
[...] and its up to you to help Neil.
From now on I will continue to report the issue at Scintilla, so I don't need to report it twice. But I let this issue at github open till there is a result at sourceforge. If you have a better handling, just let it me know.