/summon pillager ~ ~ ~ {PersistenceRequired:1b,PatrolLeader:1b,Patrolling:1b}
change it to Survival
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Thank you for your report!
We're tracking this issue in MC-195266, so this ticket is being resolved and linked as a duplicate.
That ticket has already been resolved as working as intended, which means this is not considered a bug and won't be fixed. Please do not leave a comment on the linked ticket.
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Duplicate of MC-195266.
They raise both arms like zombies since the fix for [MC-158735]. This is intended.