Can't edit a table

Details for the issue

What did you do? After we resolved the crash in Big Sur issue using the latest nightlly build, one student cannot edit a table. It allows her to change a field name in the modify table and add a field, but after she clicks ok, it doesn't take.

What did you expect to see? The table to have new field names or new fields.

What did you see instead? No changes

Useful extra information

The info below often helps, please fill it out if you're able to. :)

What operating system are you using?

• Windows: ( version: ___ )
• Linux: ( distro: ___ )
• [x ] macOS: ( x version:11.6_ )
• Other: ___

What is your DB4S version?

• 3.12.2
• 3.12.1
• 3.12.0
• 3.11.x
• [x ] Other: _Nightly build from 9/12/21

Did you also

• [ x] Try out the latest nightly version: https://github.com/sqlitebrowser/sqlitebrowser#nightly-builds
• [x ] Search for an existing similar issue: https://github.com/sqlitebrowser/sqlitebrowser/issues?utf8=%E2%9C%93&q=is%3Aissue%20

Thank you!

Start by reproducing the report on macOS 11.6 with the nightly build from 9/12/21, using the table modification flow described in the issue. Trace why renamed or added fields are not retained after clicking OK; done means those changes persist in the table.