As far as I can tell, those are just regular tandem breakers. You shouldn't use a single tandem breaker for a multiwire circuit because both sides tap the same pole. You'd have to put each half of the MWC on adjacent breakers (the bottom of one breaker and the top of another. Multiwire circuits don't require simultaneous tripping, just a simultaneous disconnect.
source https://www.inspectorsjournal.com/topic/18828-bryant-multi-wire-breakers/?do=findComment&comment=172295
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