In addition to these, I had some other integrations which I tried deleting, and can no longer re-add: econet (official), RobertD502/home-assistant-iocare (custom HACS), system_bridge (official). The latter is likely a separate issue, but I’m including it here as it showed up at around the same time as the others.
The custom coway integration issue began last year, but the developer was unable to re-create the issue I had. He was able to add my account to his HA instance no problem. However, the other integrations all stopped working last week around the time when I upgraded from 2024.5.4 → 2024.5.5 but this may not have been the exact time the issues started ocurring. I tried restoring the partial core_2024.5.3 backup just in case which did not fix.
Example log (not every error seems to be showing up here): home-assistant_dyson_local_2024-05-29T12-22-45.788Z.log - Pastebin.com