[MCM-1181] Invalid content log errors "item xxx should not exist"

Partner Rank: 4

Verification build: 1.16.100.57

Summary: Invalid content log errors "item xxx should not exist". For example, starting Infinity Plumber results in:
[Item][error]-Item 'minecraft:nether_sprouts' should not exist in this world, it's minimum supported version is '1.16.0' and the current world base game version: '1.13.0'
Impact: no apparent gameplay impact but CR can reject us which is bad news if we want to do an update or fix something.

Repro:

Download Infinity Plumber from the store.
Open it

Observed result: content log appears about invalid items even though those items do not exist in the world

Expected result: No content error log
Screenshots attached: no, error copied above