Good day,
In Finland, close to the EFRO airport there is a small lake which appears to be at a wrong altitude.
It is the Tervalampi at 66.601175, 25.920444. There is this wonderful Rovaniemi Revisited scenery which works in P3Dv4.5. It somehow "pulls" the lake down to the correct altitude, but then it looks like this:
Just put it on the very long list of required fixes
Boris