It seems to be the anchor that does not accept negative values anymore. When I change to a positive value the markers show at all zoom levels.
I concur with Henkemota. My custom markers just started to disappear on zoom change as well. The "Anchor" value was slightly larger in the Y direction to offset the marker slightly north of the "Position".
Changing the value to be within the size of the icon fixed the issue. It was working fine for weeks, so something must have changed in the API. Thank you for posting your solution as that would have been very hard to track down.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.