Recently we migrated some ASR-1001-X to a new setup with ASR-1001-HX and recent IOS versions on it. After the migration we got some OSPF sessions that kept being stuck in INIT/DROTHER. It appeared these where all ASA firewalls.
After some googling and troubleshooting I came into the following article - https://finkotek.com/cisco-asa-ospf-neighbor-stuck-in-init-state/
It seems there are some incompatibilities between ASA and recent ASR/IOS-XE releases. Basically LLS aren't supported 100%.