Add bars with aggregate Time Signature

I just noticed a curious behaviour when trying to add bars with an aggregate time signature.

It looks like you actually have to enter 2 if you want to add one bar (otherwise Dorico only adds the beats corresponding to the first of the two time signatures). So, basically, you need to multiply the number of bars you want to add by two. From the system track it works correctly:

And if the aggregate time signature is made of three time signatures, then you need to type 3 in the popover in order to add one bar, etc…