Hmm well, as I wrote in my Answer to Cipher: my very last Suspicion is that GSX is causing this
This seems to contradict what you wrote before: "Had the Error before (but had not enabled Logs). Sending the SimEvent or using the EFB (which is all the same as calling the Jetway through GSX) do not help in that Situation"
How this (correct) observation of yours, could possibly end up saying "GSX is causing this" ? Especially considering it's fixed by removing the Voloport airport ?
Maybe you missed the complete explanation, and I think part of the whole discussions was made on GSX creators channel on Discord but, with the test I made, the Jetway couldn't be triggered in ANY way, neither with a XML expression ( outside GSX ), nor with a Javascript command to send a key even ( again, outside GSX ), for some reason, only the ATC menu could operate it.
But it went completely away as soon the Voloport scenery was disabled.
and I'm also guessing on an Asobo-Bug. But imho it is more reasonable if FSDT / you report that to Asobo. I mean what should I tell them what part of their Jetway API is not working?!
The problem is, the command that doesn't work here doesn't have anything to do with the Jetway API: it's the standard trigger that has been there since the first MSFS release, and seems to be affected by another airport, but the default ATC isn't.
Of course we report errors in their API to Asobo, for example here:
https://devsupport.flightsimulator.com/questions/15345/su12b-simconnect-exception-99-when-a-scenery-has-a.htmland here:
https://devsupport.flightsimulator.com/questions/15376/su12b-help-with-simconnect-jetway-datapbh.htmlBut the problem is the Beta period is just not long enough so, by the time they release a new Beta, we code the new features, found a bug, report it, get investigated on, the Public release date is already approaching, and there's no time left to do the fixes, hoping they will be in the Update.
For the two aforementioned bugs, we already have two separate workarounds in GSX, which of course make the code slower and more complex, because to workaround the first one, we need to search for all jetways one by one ( slower ) whenever even one has a problem ( the error #99 ), and for the 2nd problem, we need to make a separate Simconnect call to read the jetway heading, because the one reported by the API is not correct.
So, in the grand scheme of things, having these fringe cases where the jetway for some reason can be operated only by the ATC menu and not programmatically, which SEEMS to be caused by scenery conflicts, is probably a lesser issue than the other two. At least, you still have the ATC menu available, if everything fails.