Filezilla get close when any process completed this issue starts after I update my Ubuntu to 20.04

When I try to edit the file it just downloads and get closed automatically. I want to stop this issue, it is been making my work very hard.

FileZilla version is : 3.46.3

I had also updated it to version 3.48.1 but the issue remains the same

Also, I tried to this solution found here which say change default file type to binary but that also didn't work for me.