Unable to add a message to an existing tag

[markochk]

Creating a tag and later trying to add a message to it, it fails (Commit window doesn't open, it just prints the error message):

$ git tag test-tag 
$ git tag test-tag -a -f
hint: Waiting for your editor to close the file... 
(re.sonny.Commit:2): Gjs-CRITICAL **: 20:38:19.094: JS ERROR: TypeError: commentLines[3] is undefined
parse@file:///app/share/re.sonny.Commit/scm.js:38:21
openEditor@file:///app/share/re.sonny.Commit/application.js:104:12
Application/<@file:///app/share/re.sonny.Commit/application.js:35:15
main@file:///app/share/re.sonny.Commit/main.js:51:22
@file:///app/bin/re.sonny.Commit:12:5

fatal: no tag message?

If I create a tag with a message and later try to change it, it also fails. The only difference is in the last line:

$ git tag test-tag -a
$ git tag test-tag -a -f
hint: Waiting for your editor to close the file... 
(re.sonny.Commit:2): Gjs-CRITICAL **: 20:38:49.572: JS ERROR: TypeError: commentLines[3] is undefined
parse@file:///app/share/re.sonny.Commit/scm.js:38:21
openEditor@file:///app/share/re.sonny.Commit/application.js:104:12
Application/<@file:///app/share/re.sonny.Commit/application.js:35:15
main@file:///app/share/re.sonny.Commit/main.js:51:22
@file:///app/bin/re.sonny.Commit:12:5

Updated tag 'test-tag' (was 37ac31b)

If I remove the editor = flatpak run --file-forwarding re.sonny.Commit @@ line in .gitconfig, both scenarios work properly and add/change the tag message.