UPDATE: I don't know what happen but i uninstalled and reinstalled the launcher again from the microsoft store and it just works fine now! Minecraft java and bedrock editions both start up normaly also.
I have the exact same issue 😞
I am so confused, i just logged in minecraft today and the cape was back!
I have the same issue, i just logged in minecraft and the founder's cape disappeared i have the skin pack but the cape is not showing up whatever i do.
Just use adventure mode...
I don't what's happeing but yesterday my launcher opened, then later in that day it did the grey screen again and then today it opend normaly again...