User Jeremie_Leroy reported issues with theme components after updating, specifically with the TOC component and tiles not loading. david identified the problem as a compatibility issue between a recent core change and the discourse-locations plugin, suggesting to try disabling or uninstalling the plugin. Jeremie_Leroy confirmed the issue and asked for further assistance regarding the broken link for the tiles.
This isn’t related to PG12, so I tweaked the title a little. It looks like a recent core change is incompatible with the discourse-locations plugin. (You can see this because there are lots of discourse-locations javascript errors in the browser console).
If you run the site without third-party plugins, it works ok: