Was VM cut at the bottom?

[eggyk]

I see signs of trimming on f90r2:

The S edge of the f90r2 panel too seems to have been cut. There seem to have been one smooth cut from the W edge, ~115 mm wide, that ends abruptly, then a second cut that starts ~0.5 mm lower and continues to the E edge.  The cuts are slightly curved, but that may be due to vellum curvature.  The part that was cut away may have been another triangular sliver ~150 mm wide and ~4 mm tall at the E end.

I assume this refers to this area on f90r2:
   

If so, it seems to be mirrored on f90r1:
   

Both of these are roughly equidistant from the fold (these horizontal arrows are identical), implying that if this is a cut, it happened when while it was folded. Apologies if this was already discussed elsewhere.