Avoid multiple segmentation bitmasks for a given detectron2 instance?

[Greg7000]

Given a detectron2 instance segmentation context.

Does anyone out there knows an easy way (ideally by setting some parameters
in https://detectron2.readthedocs.io/en/latest/modules/config.html#yaml-config-references) to reject results where for a given instance multiple bitmasks patches have been detected?

Exemple (hand made exemple, can't use my real results)