See the screenshot for example -
As you can see, I'm trying to add a comment in one of the 1Password Community topics, and 1Password treats the comment box as a fillable field and offers autofill.
Same thing happens in Github issue comment boxes too.
1Password Version: 1Password for Windows 8.10.0 (81000012)
Extension Version: 2.5.2
OS Version: Windows 11 22H2