Hi, I had a similar issue. After upgrading to 'buster' my printer doesn't work. After downgrade ghostscript, libgs9 and libgs9-common to version from oldstable (ghostscript 9.26) everything is running as usual.
Schultze -- Der Politiker denkt an die nächsten Wahlen, der Staatsmann an die nächste Generation. William Ewart Gladstone