I have a raid farm that I built off of a tutorial on YouTube. When I was repairing the farm, a raid spawned in with on the the Ravengers. The avenger got out and went into the nether. When I killed him there, it would not resent the raid. It took logging in and out many times before it would clear.
I use the Minecraft android version on a Mac.
Thank you for your report! However this issue has already been reported as MCPE-45532. If you have anything to add to the conversation feel free to comment there. Also, please search for an issue before creating a ticket. Have a great day! 🙂