This simple, MS Word created DOCX document has a single form control checkbox. The checkbox can be checked/unchecked in LibreOffice Writer even after saving and reopening the document. But when the document is saved with the checkbox checked, it cannot be unchecked it MS Word.
Steps to Reproduce:
1. Open the attached document in LibreOffice Writer.
2. Check the checkbox and save it as DOCX.
3. Open the modified file in Microsoft Word.
The checkbox cannot be unchecked anymore in Microsoft Word by simply clicking on it.
The checkbox should work just like in the original file
User Profile Reset: No
Created attachment 146480 [details]
The original file with the unchecked checkbox.
Created attachment 146481 [details]
The file with the checkbox checked in LO Writer.
Created attachment 146482 [details]
A screenshot showcasing the issue.
I confirm this with
Version: 184.108.40.206.alpha1+ (x64)
Build ID: 8274c4c62df5b937b3f0bec9e1eeca85f3b219d4
CPU threads: 4; OS: Windows 10.0; UI render: GL; VCL: win;
TinderBox: Win-x86_64@42, Branch:master, Time: 2018-10-22_01:47:50
Locale: en-US (de_DE); Calc: CL
This is not a 'Content Control', but a 'Check Box Form Field' from the 'Legacy Forms' category. These can only be changed in Word once the document is restricted via 'Restrict Editing', with only 'Filling in forms' allowed.
The attached document isn't restricted, so the checkbox can't be flipped in Word, neither the original, nor the roundtripped one. This is the expected behavior.