Anton missed one point.
When using scissors, two types of defects can appear.
1 / Saw formation (steps) if the cut is made with scissor tips (section “C”).
2 / Burr formation. If you made one cut, and the next time you press the scissors, you did not align the X points (scissors) and Y point (on paper), but started cutting from the Z point.
Why is the scratch from the knife not deep?
If the Q18 was heavy (analogous to ROS), then it had to be attached to an additional gasket located UNDER Quire, in the same way as it was done when attaching the Q14.
When cutting Q18, it was necessary to cut through the gasket first, then the knife may touch f96v.
It looks like we can see the remnants of the glued spacer (blue rectangle.)
On f93r, the spacer corresponds to a light green rectangle. Remaining glue may be visible.