AI buildings load extremely late (or not at all)

I noticed something very odd in SimUpdate 5:
When flying in VR, for example flying over some villages with AI buildings, the AI buildings often don’t get generated.
All I see are the flat satelite images of the houses… the AI buildings don’t get genered. Especially in VR.
In 2D mode, they seem to appear more often.
In VR, they often start to popin after a while, but with “after a while” I mean one minute of hovering over some village. Ridicioulus.
Is that caused by a certain setting?
It is extremely annoying when most AI buildings are just gone or popin so late that you almost crash into them.
(This does not hapen with photograpetry buildings)