Description:
The insert button in the Fields dialog is grayed out, disabled and won't insert some field options that should be available.

Steps to Reproduce:
1. In the attached document, in the menu bar select Insert > Field > More Fields... (or press Ctrl + F2)
The Fields dialog menu will open and have the “Document” tab automatically selected and most of the types will be available to insert.

2. Select the “Cross-references” tab and on type select “Bookmarks” (or any other type that is not available). The insert button is grayed out since no bookmarks are available.

3. Then select the “Document” tab. The Insert button is grayed out for all the types that were previously available and you can’t insert them.

Actual Results:
The insert button is greyed out and disabled for some of the fields that should be available such as date and file name

Expected Results:
the insert button should not be greyed out and still be able to insert fields that are available


Reproducible: Always


User Profile Reset: No

Additional Info:
The workaround is to go back to the “Cross-references” tab and select a type that is available to activate the Insert button again.

This behavior is not present in older versions 3, 4 and 5


Reproducible starting in:

Version: 6.4.7.2 (x64)
Build ID: 639b8ac485750d5696d7590a72ef1b496725cfb5
CPU threads: 8; OS: Windows 10.0 Build 19045; UI render: GL; VCL: win; 
Locale: en-US (en_US); UI-Language: en-US
Calc: CL

and

Version: 6.4.7.2
Build ID: 639b8ac485750d5696d7590a72ef1b496725cfb5
CPU threads: 8; OS: Linux 6.5; UI render: default; VCL: gtk3; 
Locale: en-US (en_US.UTF-8); UI-Language: en-US
Calc: threaded