So it looks like the Ambassador PokéStop near this location could potentially make the other PokéStop disappear? It’s very close to Bahnhof Halle Zürich HB – 47.377793, 8.540903.
The red marker shows the Community Ambassador PokéStop exact Location: 47.377713, 8.540884, which is very close to “Bahnhof Halle Zürich HB” Wayspot.
There are a few more Wayspots nearby in this cell that could be activated instead of the affected Bahnhof Halle Zürich HB. These are not so close to the Ambassador PokéStop.
I’m aware that this is a gameboard-specific change, but currently it is just an empty cell at the main station, with several Wayspots in this cell that would be eligible for inclusion as PokéStops. This was also mentioned in another thread: Accepted Wayspots am Zürich HB nach kurzer Zeit entfernt - #4 by wooperIooper , so it could possibly be the issue here.