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You're approaching the problem from the wrong angle. You didn't miss
anything in the syntax, rather in the purpose.
"notfound" performs the exactly opposite action of "found" - it removes
a version from the set of "found" versions; for #586646, as you noted
yourself, that set only contains "revelation/0.4.11-6", so asking
debbugs to remove 0.4.11-9.2 from it is a no-op.