Sharing tab groups between different profiles

Further to Tab groups with different profiles

I have been enjoying the introduction of tab groups and I note that the groups I create are shared between some of my profiles but not all. Is this expected behaviour? I expected all or nothing inter-profile.

Steps to Reproduce (add as many as necessary): 1. 2. 3.:
Create tab groups in profile 1, enable sync everything. Tab groups appear in profile 2 and 3 but not in 4.

Reproduces how often: always

Brave Version(See the About Brave page in the main menu):

Version 1.78.102 Chromium: 136.0.7103.113 (Official Build) (x86_64)

Type of devices currently running on the Sync chain in question:
Macbook Air - profiles and tab groups
Android - no profiles on mobile but tab groups created on mobile appear as unnamed tab groups in some of my desktop profiles but not all