That’s bad, I’d say that this is something they need to fix, but since you don’t have a repro, it could be weird to report too
To avoid patrolling I’d tell you to try applying low speed movement modulators on the guards (not sure if that works)
But for guards being not able to aim, this is another problem, maybe try to understand what they’re trying to do, does it happen on all the guards ? Are they trying to reach somewhere ? Did you try to visualize the navmesh to see if anything is wrong ?
(navmesh debugging option in Island Settings)
Are you using World Streaming also ?