The signed revision's DocMDP permission was looked up by walking the old
revision's signature fields, but the walk stops at a depth and a
qualified-name budget. When it stopped before the signature that ends the
revision, infos certify was left as the value read from the current
document, so a later /P rewrite could speak for the signed revision.
The walk now reports that it was cut, and the lookup then claims no
permission instead. Standalone-timestamp exclusion takes its values from a
separate walk that builds no names, so the name budget cannot hide one.