Cannot retick a checkbox after unticking it in a form

[DokterKaj]

Distribution

Mint 22

Package version

4.2.2

Frequency

Always

Bug description

In a PDF form, after unticking a ticked checkbox, it cannot be ticked again.

Steps to reproduce

1. Download a PDF form (e.g. https://media.wizards.com/2022/dnd/downloads/DnD_5E_CharacterSheet_FormFillable.pdf) and open in Document Viewer
2. Tick and untick any checkbox
3. Try to tick the same checkbox again

Expected behavior

The checkbox should be able to be ticked

Additional information

It seems that ticking and unticking a checkbox fundamentally changes something about the PDF. If you follow the steps below:

1. Open a PDF form in Document Viewer
2. Tick and untick any checkbox
3. Save a copy to disk
4. Open the copy in Firefox
5. Tick the same checkbox (it works)
6. Save a second copy to disk
7. Open the second copy (in either Document Viewer or Firefox)

Even though it looked like the checkbox was able to be reticked in Firefox, the checkbox remains unticked in the second copy.

[poldon]

I just noticed this exact behavior in version 4.6.3. It appears to be losing the checkmark image itself in some of the boxes. When I use Chrome to open the same PDF after a copy was saved by xreader, clicking in the box shows no checkmark, but Chrome seems to be treating it like a checkbox that is clickable. Use the IRS Form 1065 PDF as an example. This is what I was working on when I suddenly couldn't check some of the boxes.