I think I spotted and SEO bug. If you go to a url:
https://invisioncommunity.com/forums/topic/461972-xyz
the real money is the "461972". IPB treats that as gold so even if a topic is renamed it just redirects you to the latest url/topic. So if you type in https://invisioncommunity.com/forums/topic/461972-xyz2323232 it would redirect to the latest furl for the topic.
Here is the issue. Take this topic. The old behavior was if I change the name/furl for this topic to:
https://invisioncommunity.com/forums/topic/461972-hump-day-46-beta-2-is-NOTLIVE
it would redirect correctly to:
https://invisioncommunity.com/forums/topic/461972-hump-day-46-beta-2-is-live
But now it redirects to:
https://invisioncommunity.com/forums/topic/461972-hump-day-46-beta-2-is-live/?ct=1622349311
Which for whatever reason includes the current unixtimestamp. Odd. And it splits SEO rankings up (dilutes = bad).
The canonical isn't wrong, upon source inspection (https://invisioncommunity.com/forums/topic/461972-hump-day-46-beta-2-is-live/). But why ever add the unix time stamp?