I have a site that has problems similar to Editing a poll changes votes to NaN%.
There are several multiple-item polls in a post and they were working for some time and now all show
NaN. There is no open/close in the UX:
Another poll that I created shows the close button:
(And I was able to close and open that poll).
"Discourse 2.9.0.beta14 - https://github.com/discourse/discourse version 4e92a6e8045822fbdea69b7179c6235c55cc9923 (I’ve been trying to update, but they have complicated themes and an overworked theme developer). I guess I can next try restoring this database to an updated staging site to see if that fixes it.