Garmin allows you to disable deco lockout both before and after a dive. I leave it turned off.However, looking through the Garmin manual, ascent rate doesn't appear to be one to trigger a lockout. Only violating a decompression ceiling for more than 3 minutes will trigger a 24 hour lockout, and that will be after the dive disabling the Single gas, Multi gas, and CCR dive modes.
Descent Mk2/Mk2s Owners Manual - Dive Setup
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