Comment 56 for bug 1945368

@Anje: Thank you for your work in support.

> But it seems likely the original problem for those using google was the addon could not update because it was not ready when version 91 was released. Getting the addon updated and recreating the calendar seems to work.

The real issue was, that the google provider installed in TB78 claimed compatibility with TB91 as well, which in fact was wrong and then it failed to load/view the events in TB91 after the upgrade. You did not miss the update for the provider, there simply was none. It should have disabled itself (with a big yellow "I am incompatible" warning in the add-on manager) and the google calendars should have been disabled as well with no option to enable them. I do not know, if the broken google provider had negative effects on the general calendar system and therefore could have caused the empty home calendars as well.

Once the real working version of the provider for TB91 was released, the google related issue was resolved. We made changes to the add-on system, that add-ons like the google provider can no longer claim compatibility with the next ESR per default, so something like this should not happen again next year.

FYI: We still have a few add-ons which falsely claim compatibility with TB91 and could cause issues popping up in support (see https://thundernest.github.io/add-on-reports/tb91-experiments-without-upper-limit.html)