Definition of "list_filter" is incompatible with definition in base class "ModelAdmin"

[hongquan]

I have a Room model and many other models which have foreign key to Room:

room = ForeignKey(Room, on_delete=models.CASCADE)

In admin, I define a mixin:

class RoomBoundMixin:
    list_filter = (
        'room__farm',
        'room',
    )

to use in other AdminModel:

@admin.register(ConditionAlarmRule)
class ConditionAlarmRuleAdmin(RoomBoundMixin, admin.ModelAdmin[ConditionAlarmRule]):
    ...

However, MyPy throws:

error: Definition of "list_filter" in base class "RoomBoundMixin" is incompatible with definition in base class "ModelAdmin"  [misc]

How to solve this?