Assert "InventoryTransaction:serialize - serializing an invalid item stack serverNetId"" when completing a race in Extreme Speed Runner

Partner Rank: 4

Verification build: 1.15.0.51 3706814

Summary: Assert "InventoryTransaction:serialize - serializing an invalid item stack serverNetId"" when completing the tutorial in Infinity Plumber

Impact: Asserts are bad and can result in failures during cert and content review if they're not caught and logged. While there is no apparent gameplay impact, it's clear there is something going wrong under the hood.

Repro:

1. Download Infinity Plumber from the store.
2. Create a new world with the Infinity Plumber template.
3. complete the tutorial up to the point where you stand on the sewage sucker
4. stand on the sewage sucker

Observed result: Assert shown

Expected result: No assert
Screenshots attached: Yes, above