New Audio Engine Affects Concatenator and Oscillator nodes

I’m using 4.20 (not sure whether this occurs in older versions), and have just activated the new audio engine for this project.

I’ve gone back and revisited some existing soundcues and noticed that the Concatenator is putting very long pauses between sounds, and the Oscillator nodes appear to be behaving strangely - any pitch changes are much lower than they should be (if I change the parameters of the Oscillator nodes to be double what they were, things start to sound more ‘normal’).

If I go back to the old audio engine, everything works as it should do.

Can anyone advise?