Profiles and Favourites

I have noticed that profile-specific favourites do not work in Kodi v18.
I am using the Milhouse LE test builds.
For the moment, I cannot test with OSMC v18 test builds due to other profile-related issues.

All profiles share the ‘favourites.xml’ file in userdata instead of using the file in userdata/profiles/<profile>.
It does not appear to be skin-related. I created a test profile, using all defaults and it sees the favourites created by other profiles.

This does not occur on v17.
It appears to be a Kodi core issue rather than LE/OSMC specific, although as stated above I have not verified on OSMC v18.

Is anyone else seeing this?
Any ideas?