Assert Failure

Partner Rank: 3
Partner Team Reporting: Mythicus Studios
Verification Builds: V1.18.20 Win 10.0.19041.1
Summary: I received an assert failure joining one of our maps (as the non-host) in multiplayer. Minecraft then proceeded to crash. The host remained connected

I can provide videos of both our content working and the content not working for content review through DM.

Impact: Multiplayer will not work with this content

Repro Steps:
1. Join content through multiplayer (both in dev version)
2. The player joining will then proceed to crash

Observed Results: Assert appeared. This breaks our content multiplayers functionality.

Expected Results: No Assert failure. Player joins as expected
Regression Build: Not sure
Screenshots:

 

Notes: 

---------------------------
Assert Failure - ctrl+C to copy this message to the clipboard!
---------------------------
Assertion failed: ID Already taken! Please fix!
Condition is false: getItem(actualId) == nullptr
Function: ItemRegistry::registerItem in D:\a_work\2\s\handheld\src\common\world\item\registry\ItemRegistry.cpp @ 110

---------------------------
OK
---------------------------