What happened to the back history caching in 120 or 121?

I updated my firefox from 119.0.1 to 121.0 two days ago, and have noticed a for my usage quite significant change:When I have a page, say a search engine query or a gallery of links on a page, and I open one then go back, previously I got the cached version. Within reason of the cache size I could go back a few pages even days later and critically see them as they where, just like I would expect for a tab I have open.

I use this behavior to work through essentially todo lists, so now that the lists get reloaded every time I visit them, this combines with server side caching to make the list jump around quite annoyingly.My expected behavior would be the cached back history being served when available, except when I manually hit F5.

Was this change intentional? Is there any way to get the old behavior back?

Edit:It seems to be a bug and only happen on some profiles, potentially dependent on some metric related to heavy use, like number of open tabs and windows.Edit:It seems to be related to uBlock Origin.Edit:It is definitely an issue within ubo, I will add a link to the issue there when I create it.Edit:It seems to be caused by the "AdGuard Tracking Protection" filter list within ubo.Edit: issues:ubo filters: https://github.com/uBlockOrigin/uAssets/issues/21841AdguardFilters: https://github.com/AdguardTeam/AdguardFilters/issues/170172Edit:It was fixed a few minutes ago, the changes should percolate through to ubo soon™. Thx Yuki2718.