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Thanks ! Yes it is Dexia rustica and yes it is very weird.
The vertex is too narrow for a female, yet too broad for a male.
The abdomen is too grey for a male, yet quite reddish for a female. And there are discal setae, which is OK for a male but not so for a female.

I am suspecting this is an intersex. That might sound extreme, but in my experience these are not soo rare, about 1 in 1.000 or so.

Theo