Hi Sibro,
This is even more interesting.
I upgraded the old laptop from Build 19045.3155 to Dev Build 23493.1000 and Safe Mode works just fine on this old machine. 🤣🤷♂️
No error and no flashing screen either. 😎👍
Mystery of MS. 🤣🤣
Edit:
I got this one to fail Safe Mode too after checking for updates and getting this Update Stack Package.
Now it fails exactly the same way as the 2 Desktops that I mentioned earlier. 🤣😜😜🤷♂️
Same error message and flashing screen.
Other updates that came down were the Security kb5007651 Version 1.0.2306.10002-0 and the MS Edge browser that updated to the Beta Version.
Looks like the problem is caused by one of the experimental A/B features enabled by MS in this Build.
Now I will have to try to isolate the culprit. 😎
I found which feature is causing the problem but is one of those subjects that cannot be discussed in this forum. 🤐🤷♂️