PAS shader nodes locked, will not accept new edits

[SongCast]

System Information
Operating system: Windows-10-10.0.22000-SP0 64 Bits
Graphics card: NVIDIA GeForce RTX 3060 Ti/PCIe/SSE2 NVIDIA Corporation 4.5.0 NVIDIA 511.79

Blender Version
Broken: version: 3.1.0, branch: master, commit date: 2022-03-08 18:16, hash: rBc77597cd0e15
Worked: (newest version of Blender that worked as expected)

Short description of error
I created a binary sun from the Earth PSA asset and edited the attributes of the suns via the World shader node editor. Unfortunately, now when I re-open the blend file to make further edits, the nodes will not accept any new edits. Maybe this is a Blender issue? but I've never encountered this issue before. Thanks.

Exact steps for others to reproduce the error
Open the file and try to edit the World Shader nodes.

blend_file.zip