Cannot convert a public topic to a PM - says Incorrect Topic Allowed Users

I can successfully convert some public topics to PM, but not all of them - because for some topics it says incorrect topic allowed users.

What might be wrong and how to fix it?

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Hello,
This has been reported already:
https://meta.discourse.org/t/undo-conversion-from-topic-to-pm-with-pms-disabled/129500

To fix it when it happened to me, I just refresh the page.

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This is not the same issue. I had no message about “incorrect topic allowed users” (and numerous refreshes and reloads of the PM page didn’t put the option in that menu for me).