Can join from second device on same account, resulting in inventory duplication.

When playing on my Xbox, I can join the game(through LAN) on my phone on the same Microsoft account and I will join as ImpishBeast(1).  When I joined on my phone it had duplicated my entire inventory from my Xbox character and now have 2 sets of armor and tools.
Bedrock, Xbox, phone, caves and cliffs experimental mode turned on.