Maintain altitude is literally impossible after update 1.18.14.0

[ResPublicae]

Do you have any add-ons in your Community folder? If yes, please remove and retest before posting.
No
Are you using Developer Mode or made changes in it?
No
Brief description of the issue:
It’s impossible maintain altitude designed for ATC
Provide Screenshot(s)/video(s) of the issue encountered:

Detail steps to reproduce the issue encountered:

PC specs for those who want to assist (if not entered in your profile)

Build Version # when you first started experiencing this issue:

Are you on the Steam or Microsoft Store version?
Yes
Did you submit this to Zendesk? If so, what is your ticket #?

[LongHaulSky]

Are you referring to the bug where ATC will continuously ask you to climb to your cleared altitude, even when you’re already there?

If so, it’s a known issue discussed in this thread:

VATSIM / IVAO / PILOTEDGE Users - Be aware of an important bug!

Good morning all! Most probably haven’t discovered this, but in the SU5 release notes there is a comment that states the following: AIRCRAFT/AVIONICS Plane altitude is different than expected No known workaround This can be extremely problematic when flying on VATSIM. You may find that in your sim, the altitude is set at the proper FL320 for instance with the correct altimeter setting. If you look at an external client like Foreflight, VATspy, etc. you’ll find that your altitude can be of…

[NeoKingRthur]

I’ve posted a workaround for this that you can apply in the mean time.

ATC problems since upgrade

Yeah, this seems to happen because the ATC doesn’t seem to tune their own altimeter to STD altimeter, it keeps harrassing you with the altitude because they’re reading using the local altimeter under the transition altitude. The workaround for this is that if they tell you you’re 300 ft above the assigned altitude, you disengage the STD altimeter and set it so that it’s showing you are 300 feet above your assigned altitude, then use your autopilot to descend back to that assigned altitude, that…