I found this bug out during my climb to FL450 using a Citation Longitude, whom has a rated service ceiling of 45,000 ft. When climbing past pressure altitude 44,646 ft, the altimeter will appear to “stall” at this amount, despite the vertical speed indicator still indicating a climb. In fact, the climb does magically becomes easier—I noticed a positive climb up to 1000+ fpm at one moment!
This occurred roughly during 2022-02-05 08:25 UTC. I noted that a Live Weather outage happened during a similar period a few days ago from this writing (not related to the 72-minute period where the sim refuses to fetch weather model data.)
Additionally, the bug occurs at a similar altitude where a previous major issue with Live Weather data happened regarding incorrect unit conversions above a threshold altitude (FL440+). I wonder if this could be related in that the bug is server-side since it is due to incorrect data?
Image 1: Read pressure altitude of FL450.
Image 2: Volanta shows fetched sim data of 49,870 ft AMSL. Note the brief steepness in the slope just before leveling off at the cruise altitude.
If need be, here’s the flight plan I was using where the bug occurs. Set your cruising altitude to FL450 or higher: UASKZMBN_MFS_05Feb22.pln (11.4 KB)