open with dialoge default for one file type changes other file types

Distribution

mint 22.1

Package version

6.4.8

Graphics hardware in use

No response

Frequency

Always

Bug description

open with dialoge default for one file type changes other file types.
specifically .conf and .dav for me, but possibly other filetypes as well

Steps to reproduce

1: right click a file with the .conf extension, then open with, then other application
2: in the open with window that comes up, click text editor, click set as default
3: now other files with an unrelated extension, such as .dav, will open with the text editor, instead of video player like it was before, even though nothing was changed for this filetype

Expected behavior

for each extension to have its own "open with" options

Additional information

In this screenshot, whatever I set as default for one window will immediately duplicate in the other window despite each being for two different filetypes

The report names no source files or tests. Reproduce the issue using .conf and .dav files, then locate Cinnamon's open-with dialog and file-association handling; done means changing the default for one extension no longer changes the other.