The article linked doesn’t give a good recount of what transpired in the courtroom.
But the judge’s questioning did reveal a disagreement over whether the agreement on the tax charges was linked to a gun charge against Biden. Prosecutors said it wasn’t; Biden’s team thought it was - and they repeatedly argued about it in open court.
Stopped using Reddit as soon as it was clear that they were destroying 3rd party apps. Occasionally a search result brings me there, but I try to avoid the site all together where possible.