Another thing I’ve noticed (not sure if it’s the same or another bug), is that when you reply on a filtered topic and then click to show some of the previous hidden replies, the new reply appears on top of the older replies.
The order goes back to normal after refreshing the page.
Apologies for the delay @Nacho_Caballero, this is now fixed. It should keep the filters and the bar with the “Show All” button visible after editing a post or replying.