I see Mueller is pissed:

Mueller Told William Barr He Mischaracterized His Findings

Mueller complained to Barr that his four-page letter did not fully capture the context, nature, and substance, of the special counsel report, according to the Post.

There is now public confusion about critical aspects of the results of our investigation. This threatens to undermine a central purpose for which the Department appointed the Special Counsel: to assure full public confidence in the outcome of the investigations, Mueller wrote in a March 27 letter, the Post said.

I think Barr implied that Mueller was on board because it was reported that Mueller was working with Barr on the redactions. No wonder Barr is pissing his pants over his House testimony. His testimony and Mueller's are likely to be quite different!