I too am using the 20A5395g BigSur 11.0 beta, and am unable to print to my Lexmark CX517de printer, consistently receiving the "filter failed" message. The BigSur beta is using the same Lexmark universal driver 2.1 as is being used on another Mac on my network running an older version of MacOS; I have never had this printing issue before. Also, for what it's worth, I verified that my printer firmware is the latest version, reset the printing system in System Preferences, and reloaded the printer drivers. Still no go. Of note, the printer's scanning function appears to be working perfectly on BigSur. I'm very much interested in finding a useful solution for the printing problem!

An update from last week-- the problem is persisting with the latest BigSur version 11.0.1 Beta (20B5022a)-- same filter failure error with my Lexmark printer. Any thoughts/suggestions?