LO2022 - dimension - scale controls greyed-out; 'Not Scaled'


Control over dimension scale lost. a bug?

Some dimensions on the page of this small test file have the two control fields (Auto-scale and dedicated scale selection dropdown) greyed out and the dimension anchor has a large circle displayed, when dim is selected.

I have not seen this before and could not find a matching topic in the forums archive…
The viewports have been copied, otherwise have same settings.
the dims have same settings (matched with eye dropper).
The bug happens at seemingly erratic behaviour.