I'm on version 2021.12 build 102.
Dim Solo doesn't work when Patch Point is used.
Here's my test configuration.
Track 1: Audio clip, Output: Master
Track 2: Audio clip, Output: Patch point1
Track3: Input: Patch point1, Output: Master
with DIM on, When tack1 is soloed, Output from Track3 is NOT dimed.
Track2 or 3 is soloed, Output from Track1 is dimed.
Thank you!