Routing Folder Inside Routine Folder - Solo Issue

[John9281]

Pro Tools 2021.12.0
Windows 10 Pro, Version 21H1, OS build 19043.1526

I have a routing folder called Inner Routing inside an outer routing folder called Outer Routing.

Outer Routing is my effects stem. Inner Routing is for ambience.

If I solo any audio track in Inner Routing or Outer Routing, it mutes the unsoloed tracks as expected.

Because I use Inner Routing frequently, I moved it to the top level i.e. outside Outer Routing.
I did not make any other changes.

When I solo an audio track within Inner Routing, it does not mute the Outer Routing audio tracks as expected.

Is this a bug?

Thank you for the feedback.