N12 horizontal zoom issue - waveforms disappear on zoom

The following zoom problem in Nuendo 12 appeared out of nowhere and I am looking for clues how to fix this.

When zooming in/out via timeline click and drag, all waveforms temporarily disappear until I stop zooming. Yet, when zooming horizontally via cmd+mousewheel or the assigned keys, everything behaves as expected and the waveforms are visibly at all times.

I can find further posts on similar behaviour here, yet without any remedies.
Save start and also disabling 3rd party plugins does not solve it.

Running Nuendo 12.0.70.464 on macOS.

Thx!

You must have activated the “Quick Zoom” preference: See Editing in the manual.

Thanks for the hint! Quick Zoom was activated, disabling it solved it.