On xbox one bedrock, I found out transferring a save with the fireworks from Xbox One Edition and using those fireworks that you made an Xbox One Edition and the new bad rock version the game will Crash immediately in the meantime if I craft new fireworks and Bedrock version in the same world use those fireworks instead it won't crash so it's the fireworks from Xbox One Edition from transferring over to bed rock version, ( while flying with the Elytra )