'la maison de poupées' is NOT 'the doll's house'. It is 'the dolls house' or, more pedantically 'the dolls' house'
Having looked at different dictionaries, it seems that you can use: dollhouse [US], doll's house / dolls' house [UK]. See link here too: Dollhouse
I hope this is helpful.
Bonne journée !
I agree with you so I suggest you flag it as an error.
I believe that "la maison de poupées" can be both: the dolls' house as well as the dollhouse.
The doll's house means doll in the singular. The house of the [one] doll.
The dolls' house means doll in the plural. The house of the [several/many/more than one] dolls.
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