I'm seeing a related problem in the VTE with bash in the Geany terminal. It seems to be trying to honour my PS1 setting but is adding a lot of other rubbish as well. I have PS1 set to "\w $" which should give me:
~/SRC/GITHUB/gwsmgitd $
but I get:
]777;notify;Command completed;./gwsmgitd]7;file://mudlark.localdomain/home/peter/SRC/GITHUB/gwsmgitd~/SRC/GITHUB/gwsmgitd $
instead. I don't know whether it's a bash problem or a Geany problem but I do not get this problem in my own PyGObject scripts that use Vte version 2.91.
It's a bit annoying as it takes up most of the line and also seems to interfere with line editing at times.