local adjustment cursor disappears when LR is on second screen

Dear Community

Following setup:

MacBook Pro 2019, i9, 16GB RAM, Retina

EIZO ext. Monitor connected through USB-C HUB with HDMI

Lightroom Classic 9.2

When I use LR on the external screen and choose the local adjustment, e.g. spot healing brush, and I move the cursor from the tools over to the image, the cursor disappears and I cannot see where it is until I press the mouse button and start using the brush - but cannot target it. The cursor only appears again, when moving it outside the picture again.

When doing the same thing on the integrated display, everything works as expected and fine.

What I did / figured out so far:

- It happens when controlling the cursor via mouse, touchpad and wacom tablet

- GPU Acceleration switched on / off and restarted

- Reset LR to defaults (OPT+SHIFT while starting LR)

- tried different pictures, working on the original, working on the smart preview

Any ideas on this?

Thanks so much in advance,

Torsten