I purchased everything, excepted of WAVES Tune Real-Time by Cubasis 2 a long time ago. Transfer to Cubasis 3 worked for all of them also a long time ago.
A few days back I purchased WAVES Tune Real-Time by Cubasis 3.
The iPad was restarted, all purchases are available, excepted of WAVES Tune Real-Time, it’s the only purchase that needs a restore each time I launch Cubasis 3.
FWIW both, Cubasis 2 and Cubasis 3 are installed on the iPad. I’ll not migrate old projects from version 2 to 3, hence I keep the old version.
iPad Pro MTFR2FD/A
Cubasis 2 Version 2.8.4
Cubasis 3 Version 3.2