Version 3000.11.4.1-1 of haskell-haxr is marked for autoremoval from testing on Mon 08 Aug 2022. It depends (transitively) on haskell-polyparse, affected by #1013784. You should try to prevent the removal by fixing these RC bugs.
Migration status for haskell-haxr (3000.11.4.1-1 to 3000.11.4.1-2): BLOCKED: Cannot migrate due to another item, which is blocked (please check which dependencies are stuck)