Description:
After exporting a form with option button groups to PDF with default options in Writer 6.4.2.2 on Winx64, the option buttons do not work in PDF readers (Acrobat Reader / EDGE)
Tried with many permutations of grouping Option controls by 'Group name', 'Name', and 'Label' properties.

Steps to Reproduce:
1. Create a new Writer document
2. Enable form Design Mode
3. Add a new Option control
4. Change its Label property value to 'Option Button A'
5. Change its Group name property value to 'OB1'
6. Add a new Option control
7. Change its Label property value to 'Option Button B'
8. Change its Group name property value to 'OB1'
9. Save the document
10. File -> Export As... -> Export to PDF -> Save

Alternates attempted with similar poor outcomes:
Two Option controls with the same 'Name' property value, but different Label values.
Two Option controls with the same 'Name' AND 'Label Field' property value, but different Label values.
Two Option controls with the same 'Name' AND 'Label Field' AND 'Group name' property values, but different Label values.
Two Option controls with the different 'Name' property values, but the same 'Group name' property value
Two Option controls with the different 'Name' property values, but the same 'Label Field' property value


Actual Results:
1. Open the new PDF file with EDGE (Default .pdf handler for Windows 10)
2. Form is opened and rendered but the option buttons can not be selected/changed

1. Open the new PDF file in Adobe Acrobat Reader DC
2. Form is opened and rendered but the option buttons can not be selected/changed


Expected Results:
1. Open the new PDF file in Adobe Acrobat Reader DC
2. Form is opened and rendered and the option buttons can be selected/changed



Reproducible: Always


User Profile Reset: No



Additional Info:
Help -> About copy-able content:
Version: 6.4.2.2 (x64)
Build ID: 4e471d8c02c9c90f512f7f9ead8875b57fcb1ec3
CPU threads: 16; OS: Windows 10.0 Build 18363; UI render: default; VCL: win; 
Locale: en-US (en_US); UI-Language: en-US
Calc: CL