Game crashes when killing blaze in nether

My version of Minecraft is 1.2.3 but it won’t allow my to select that in the affects version slot, it says it doesn’t exist. I built two blaze spawner a side by side on my realm (bedrock 1.2.3) when I fired them up the game crashed. So I deactivated one and fired up the other it worked for a minute or two then the game crashed. I’ve checked and rechecked the Redstone and positions. I have two spawner a in the over world and they don’t cause a crash. I fired the blaze spawner up again and it worked for three minutes then the game crashed and when I logged back in I’d been moved through the nether and in the arms of a wither skeleton...switched to peaceful went back to my spawner fired it up again in normal and the game crashed after 5 minuets of killing blaze....I don’t understand what’s going on here but it’s tied to the blaze. Even when they weren’t built into a killing machine the game would crash after spawning 3-4 sets of blaze.