PROBLEM

Starting Minecraft from the launcher, the game appears to hang at 35% for a long time. Eventually the game may start after 40 minutes. This behaviour is new with version 1.20.30.2. The Application Event Log shows an entry showing the Minecraft App has been killed by Windows early in the process of starting up.

WORKAROUND

On one occasion, to work around, I could start Minecraft App outside the launcher directly within a couple of minutes. This is not reliably reproducible as a process however.

SUPPORTING LOGS

Event viewer shows two events:

(1) Warning:

Fault bucket 1591181629539812352, type 5
Event Name: MoAppHangXProc
Response: Not available
Cab Id: 0

Problem signature:
P1: Microsoft.MinecraftUWP_1.20.3002.0_x64__8wekyb3d8bbwe
P2: praid:App
P3: 1.20.30.2
P4: 64f7c0a9
P5: 0470
P6: 2097280
P7: UNKNOWN
P8: svchost.exe:AudioClientRpc
P9: 0.0.0.0
P10: 

...

Analysis symbol: 
Rechecking for solution: 0
Report Id: 9afa31f8-1ea3-460d-8fdc-adc0ff34438b
Report Status: 268435456
Hashed bucket: 2553d46d7e07fd38b6150342f9d90400
Cab Guid: 0

(2) Error:

The program Minecraft.Windows.exe version 1.20.30.2 stopped interacting with Windows and was closed. To see if more information about the problem is available, check the problem history in the Security and Maintenance control panel.