As title says, prelates won’t pick up a relic if rallied to pick it up from a TC, unlike if they’re queued from a monastery. I’ve noticed a few mid level players getting confused by this mechanic when villagers run home, skipping the relic, if they rallied it to return with a relic.
Edit: It’s been a while since I wrote this. Im wondering if i checked wether or not age 3 was reached when the rally was initiated or when the monk spawned. If that is the case, I suppose one workaround would be to treat monks rallied to relics the same way scouts rallied to living deer; to have the action possible before relic pickup is unlocked, but to have the action following the command change.