I got a reply from DxO. At least they will have a look, will take some time…
Hello Paul,
Thanks for these details, ,
Our Team are currently checking this now, and will get back with you once I hear an update from them.
We want to manage your expectations by letting you know that the process of checking and investigating may take some time.
However, we will definitely provide you with updates along the way.
I thank you for your kind understanding and patience.
Kind regards,
And another update from DxO:
Hello Paul,
This is a follow-up message from the Team,
We are already working on this fix and will relaease an update soon but no time frame as of the moment.
We appreciate your kind understanding and response.
If you have other queries aside from this please do let me know before I close the ticket for you.
Wishing you the best & DxO Greets you a Belated Happy New Year!
Kind regards,
Sounds hopeful!
I received an update from DxO, issue should be resolved in the next update 
:
Hello Paul,
This is a follow-up message from the Team,
The issue has been fixed and the fix will be seen on the version update.
Kind regards,
I reported this in 8.2 (Trial) and got an email back - extract as follows:-
"Our Research and Development team is actively working on a hotfix to resolve the issue, which will be integrated into a future update of the software.
To ensure a seamless resolution, we have placed your support ticket on hold while this fix is being developed and tested. This approach allows us to provide you with the most effective solution as part of the upcoming update.
We truly appreciate your understanding and will notify you as soon as the update becomes available."
I am waiting to hear from them but I won’t be buying version 8 until it gets sorted out.
I will stick to PL6.19 until then. It’s annoying that this was never an issue with PL6.2 and they introduced the problem with PL6.3 which they eventually mostly fixed but seem to not have carried the fix forward to PL8