Link group insert not functioning correctly

If I understand correctly, it is supposed to be possible to link parameters of inserts on link-grouped tracks.

I am trying to set this up with two tracks with Izotope/Exponential Audio’s PheonixVerb Surround (VST3), and the insert parameters are not linking.

Turns out, its a bug with Izotope/Exponential Audio’s VST3’s.

All other VST3 plugins seem to work as expected.