Not sure if serious, but on the off chance... seems unlikely. We create "Lorem Ipsum" gibberish to fill space because modern technology has made it trivially easy to do so. The same exercise would have taken a medieval writer many laborious hours.
Or, there's something called "spirit writing" isn't there, a sort of written form of speaking in tongues? Presumably the doing of which is also considered to be it's own reward.
Heck, perhaps a scribe went psychotic.
Seems a bit of a gamble if that was the plan, and the scribes were presumably either well-to-do or trusted by someone well-to-do if they could get their hands on the raw materials. That makes the prank/con/crazy spirit writing theory seem less likely to me but certainly doesn't rule either out.