Lightmap Density Mode Issue

Hello everyone.
I have this issue, that is not a big deal, but it is a bit annoying.
For the past two versions of the engine when I enter “lightmap density” mode I get some black artefacts that are “twitiching and bliinking”.
Here is a gif to show you what I mean.
Does anyone have an idea what this is and why it’s happening and how to fix it?
Thanks :slight_smile: