I’m not sure what, but looks like something Looks like the glimmer topic list mode setting is hiding the topic solved status in the title line of Topic list pages on Meta - the code for the solution checkbox goes missing when that setting is enabled (thanks @Moin for pointing out which setting was doing it).
This will make the ‘auto’ glimmer-topic-list-mode aware of the problematic modification:
Once merged, that’ll auto-disable the glimmer topic list on Meta. Then we can follow-up with a fix to the solved plugin. (might need to add a new transformer API to core to support this use-case )