At a quick glance it may appear similar to one part of MCPE-109870 however, the buttons are not clickable, it is just the blank screen with the moving panorama.

How to reproduce (sadly not 100% consistent):

1. Boot the game and press on marketplace as fast as possible, where the marketplace is connected (in terms of having a picture/animation) to the internet but your not logged in yet. This is best achieved when you don't have fast internet
2. an error message appears saying can't access marketplace (saying wrong version but it is the latest version of the game...)
3. press the x
4. if the same message appears with the panorama in the background (instead of black like the first one), you have successfully triggered the bug
5. Press the x one more time, congrats you are now soft locked!

Video of bug: https://youtu.be/DBCD29DcOao

Incase this is hardware related I will put down some info here (keep in mind this info is from Oct 1st 2021 while the video was Dec 17 2021, so an update to pc may have occurred in that time frame. This was taken from an java crash report file):

    Operating System: Windows 10 (amd64) version 10.0
    Java Version: 1.8.0_51, Oracle Corporation
    Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
    Memory: 94307448 bytes (89 MB) / 234881024 bytes (224 MB) up to 4294967296 bytes (4096 MB)
   LWJGL: 2.9.1
    OpenGL: NVIDIA GeForce RTX 2070 Super/PCIe/SSE2 GL version 4.6.0 NVIDIA 466.18, NVIDIA Corporation
    GL Caps: Using GL 1.3 multitexturing.

System Model    Alienware Area-51m R2