glitching my world

Hello Mojang, my friend thatdaniel184 was playing bedrock Minecraft.
We were mining in a cave, and I pranked him by giving him a netherite pant and summoning a wither. Later, my friend exploded by a placed tnt. He told me that he had an iron pickaxe and armor that he showed me. Then  I went back to my base, where I saw a baby zombie with an iron helmet and a shield, with a pickaxe. I decided to kill the wither right  until it was  spawning diamond blocks, then I was mining behind my friend another wither regenerated  instead of eliminating it my friend told me to go to the nether when I was bridging I got  killed by tnt then my friend died too
please fix this. 
-RETRODRIP