We are investigating this issue.
For now, even if it is not a guaranteed workaround, can you try deleting the Shaders folder and verify the game again?
C:\ProgramData\Mount and Blade II Bannerlord\Shaders
Please note that Windows need to show hidden folders first.
Also, what is your PC specs? And it would be really great if you can upload the engine_config.txt file located under "...\Users\username\Documents\Mount and Blade II Bannerlord\Configs" pathway.
You can send your files to us via upload.taleworlds.com site. Please write your username and this threads URL into the description box so that we can find it easier. Thanks for reporting and sorry for any inconvenience!