Cannot add an image to an article after upgrading to Joomla 4.3.4

[Larion476]

I upgraded from 3.10.12 to 4.4.4
When I try to add an image to an article,
First to image or folder shows up in Media on the Administration Panel

Second, I get this message:
Property 'mime_type' of argument 'item' of event onFetchMediaItem has a wrong item. Valid: string

[AMurray]

Please post FPA report.
https://forumpostassistant.github.io/docs/

Did the migration 3.10.12 to 4.3.4 go smoothly without any other issues?

[Larion476]

It depends on what you mean by smoothy,
I had to install a new template, a new slider for the home page, a news visitor counter and I have a problem with the search, but the site is up. I have not yet tested other stuff.

[AndyS65]

I have the same trouble ... how to solve it?