I can confirm that the issue is still present on my Surface Pro 7 as well. I used the pen at work this week and encountered the black screen issue again. Darn!
Yes, I have had it happen to me a few over the past few days.
As my original post from November, very similar error code three months later, it happened this morning.
Source
Desktop Window Manager
Summary
Stopped working
Date
1/25/2021 9:47 AM
Status
Report sent
Description
Faulting Application Path: C:\Windows\System32\dwm.exe
Problem signature
Problem Event Name: BEX64
Application Name: dwm.exe
Application Version: 10.0.19041.746
Application Timestamp: 6be51595
Fault Module Name: HeatCore.dll
Fault Module Version: 0.0.0.0
Fault Module Timestamp: 54ab4a1a
Exception Offset: 0000000000035b5d
Exception Code: c0000409
Exception Data: 0000000000000002
OS Version: 10.0.19042.2.0.0.768.101
Locale ID: 1033
Additional Information 1: b111
Additional Information 2: b111fda7573a1e10441015376b653053
Additional Information 3: f2cb
Additional Information 4: f2cb04e9d7bee3b9ba950fa6b38410fa
Extra information about the problem
Bucket ID: 3af1b524c9df8794d117428742533340 (1231526171809887040)