Like always, they probably won’t fix it until they have to because fortnite doesn’t load or similar.
The driver update will come anyway. And it could very well be related - usually one update or more a month
Only other thing you can try is to check if you are forcing dx12 or Vulvan in project settings.
Whatever you do, don’t migrate to the preview engines. They are “preview” they could potentially work (and .27 seems to run OK). But they are still “preview” - meaning 9 out of 10 it can break and stall development due to bugs/issues other bs.
You could always put in a bug report.
But as you probably know they have been ignoring all of them / by the time they get back to you the driver will definitely have been updated. If that was at fault your bug report would be pointless.
Although, you could copy the project and test to see if .27 preview gives you the same issue or not.
They messed with light baking too, because they enabled SLI for it 20 years after we needed them to… the updates could potentially have included testing on a 3090 and relevant fixes…