Happy Harvest character skeleton is broken in build

Steps to reproduce:

1. Create a new 2D URP project and import Happy Harvest.
2. Build and Run the project.

Actual results: Character limbs are all connected incorrectly in the Build, like it is in Play mode.

Expected results: No issues with the character in build.

Reproducible with versions: 6000.1.0a9, 6000.1.0a7

Not reproducible with versions: 6000.1.0a6, 6000.0.31f1, 2022.3.53f1

Tested on (OS): Windows 10 

Notes:

• I am unsure that this is Happy Harvest specific, it may be a general 2D issue.