pruning based on @svennd "at user" is removing all messages contrary to what the description says:
"Only prune content from these users (leave empty to prune everyone's content)"
Remove messages for @user_to_delete
remove all messages prior to set time (if this option)
Can you take a screenshot? The red box should also say "(if they are from user_to_delete)".
I'll test locally in a moment
Can confirm it's broken - field is not picked up.
Looks to be introduced by https://github.com/RocketChat/Rocket.Chat/pull/11236/commits/811b8328c83551bb7f00fce5647c30c2a5e9c103 in a change from using Session to ReactiveVar - not all set operations were updated