Your temporary workaround does not work. Even if one has the browser configured to "always ask" it saves a copy of the file in the Download folder. By the way, this completely obviates the decision to "always ask".
Temp and Downloads aren't functionally equivalent. Temp is regularly cleaned, Downloads serves a completely different purpose - it's not a temp folder! It's not as simple as redirecting from one folder to an equivalent one, it's redirecting from one ...
The decision to change the old behavior was incredibly stupid. That every opened pdf is saved to the download folder is a huge problem, generating unnecessary workflow. I should not have to adopt a workaround to fix something that previously worked f...