Content Log displays syntax errors for vanilla mobs geometry

Partner Rank:
3

Partner Team Reporting:
Nitric Concepts

Verification builds:
1.13.0.15_rc1 UAP_x64 Publish_Test

Summary:
We received an blocking issue for New Orleans regarding content logs that are generated and it displayed syntax errors for files we did not alter.
Syntax errors include geometry files in models/entity/, and persona errors.
Attached is the content error log.

Impact:
Content that contains this issue would be listed as a BLOCKING issue as this would show up on the content log of the map. Content Review staff would have to manually pass the content instead because of the content log on syntax errors on vanilla mobs that was not altered in any way.

Repro Steps:
Step 1: Launch 'New Orleans' world from template.
Step 2: Wait while the world is being generated.

Observed Results:
Content logs displaying errors appear on the screen while loading the world.

Expected Results:
Title is free from any visible content log messages.

Screenshot/Videos attached:
No
(but the error log provided by the Mojang QA team is included as a .txt file)

Regression Builds:
This did not occur in 1.13.0.34_rc6 UAP_x64 Publish.

Notes:
This is something that we cannot currently recreate given the last save of the map and the version of the Minecraft we are currently using. We are not aware of the version of Minecraft used by the content review team.
Devices that are affected as mentioned by the QA staff: iPhone 4S, iPhone SE, iPhone 6+, iPhone 6+, iPhone 8 Plus, Nokia 2.1, Nokia 1 Plus, Samsung Galaxy J5, Xiaomi MI Mix 2, Nintendo Switch EDEV, Xbox One X (dev kit), Windows 10 PC.