Hearthlings can't scaffold when building Jetties on houses

Hearthlings first place 2 lots of scaffolding on the same tiles and then when come to take the scaffolding down ignore the first lot they put up…

Steps to reproduce:

  1. build a 2 story house with a Jetty (the first floor is lager than the ground)

Expected Results:
not to put scaffolding over scaffolding/ use the scaffolding that is already there.
Actual Results:
They build 2 lots of scaffolding and then don’t tear down the first set

The lighter scaffolding is where the 2 sets are clipping each other.

It clearly needs the rest of the scaffolding taking down.

Was unsure whether to put this in the templates that don’t build cause it builds.
Version Number and Mods in use:
3002 no mods
System Information: