Shadows disappearing

So I have a couple of spotlights in this scene. Perhaps not the best choice but that is besides the point, these are just placeholder lights anyway.

You can see in the video that if I just rotate my view/camera a little bit, shadows disappear completely. I assume this isn’t caused by incorrect shadow camera near/far values, so what else might it be?

edit: it still happens even if I use

renderer.shadowMap.autoUpdate = false;

No one has any idea? :frowning:

Are you able to demonstrate the issue with a small live example?