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Polygroups from polypaint trouble in 2024 version please help

Greetings friends help I can not understand,
I do everything as in this video but the division into polygroups does not happen, that is, it happens but only not by islands and only what is painted black, I understand the algorithm has changed? model simple for test dynamesh 512
or maybe I do not understand tell me how to do in new versions as in the video shown?