I have the same issue.
Here is the world I'm having issues with. The mob spawners are located under the base. Both skeletons and zombies are doing it, but the skeleton farm seems to be crashing the game more frequently. http://www.mediafire.com/file/te7m5ivo1lzyvtr/8sA5Xb7RBQA%253D.mcworld/file
Here is a copy of our Realm. Realm Download
Here is a clip of the issue in question The End Crash/Freeze Minecraft Bedrock 1.11.1
This is still happening in 1.19.10