My aircraft glitches trough the ground even after clearing scenery cache at EGLL 09R.
Try Restarting the IF, Resting the device and Clear the scenery cache.
If what @anon58665202 said doesn’t fix the problem, a reinstall should do, i used to have this problem and fixed it with an app reinstall.
the restart solved it, was just curious why clearing the cache didnt help
It is a known bug with that specific runway.
Hm, well thats a surface coverage issue then, not individual