Speaking with MtGox employees by email their system can't handle exceptions so the cancellation will count against the AML limit. They have however agreed to put a warning on the cancellation page to indicate that cancellations will be considered a deposit and will count against AML limit.
While it isn't a resolution I like (going to suck that 20% of my trading volume for the next 30 days is blown on a technicality) the warning is an acceptable compromise.
Hello,
Thank you for your kind understanding in this matter. Our developer is creating a token for the warning on the Mt.Gox redeemable code (withdrawal) page. We will put this up tomorrow.