Cura 4.0 Prime Tower does not purge for Support when using a separate nozzle

[TheSin 0]

I'm using a 2 in 1 nozzle so I need it to purge even if it's for support material, but it never purging, since it's switching extruders it really should follow the same rules even if it's for supports.  Makes it hard to use PVA supports if I don't get a purge on extruder switch.  I assume for 2 colours this is working find but for supports it's not registering the nozzle switch it seems.  Unless I'm missing an option that I can't find.  Any help in this matter would be great, I can upload a code file if that helps to show there is no prime on support switch.  Oddly enough in the preview the prime tower looks to be 100% support but it's only ever printing supports with E0 which is the main colour.  The print it's self looks right and it is trying to print with E1 for supports but since there is no prime it's just not working.

[TheSin 0]

If I'm not explaining it right I'd be happy to try again if their are questions, I'd love to get this sorted. I'm very anxious to try using PVA supports.

[TheSin 0]

Oddly enough I installed CreawesomeMod and in the preview it looks like the supports will use the prime tower, so it must be a setting, does anyone one know which one?  I'm going to try it tonight and see if it does indeed work, but I'm still very curious.