This really works for those 11 ultras having decrypting issues and patterns not appearing. After I have resolved the issue with the solution I posted, back again with twrp not showing my pattern after another update thus not decrypting my data.
I got this same *skkk.img in other Xiaomi community, tried and it works like a charm. I am supposed to share the good news but @xsander already posted it so I'll just promote the same and say that this seems to be the permanent solution.
Here's another download link - https://dl.akr-developers.com/?dir=skkk/TWRP/A12 which includes other models too.
The difference? the *skkk.img has this cool kid running and bears the Mi11Ultra name. The one in official TWRP doesn't. After this loads, it will prompt you the pattern and you can proceed with the update.
View attachment 43677
that worked for me thanks