When I dput a source package to landing, it gets rejected with explanation that it "is already known."
Concretely I tried several times today with firefox-esr_60.7.0esr-1pureos2really60.7.1esr1_source.changes and once with firefox-esr_60.7.0esr-1pureos3_source.changes
Severity set to highest due to zero-day bugfix needing urgent processing.