Happens on every world load to me

After breaking the pipe and placing it again, all works fine. Pipe connects and all is well

When I break both, place the controller first and very quickly place the pipe, it will also not connect.

It seems like the Controller first validates all connected Drawers before exposing the sides as 'connectable' to the world and so the BC Pipe cannot connect when it is looking for possible connections?

is it this side or BC side or both or me?

Forge 1.8.9-11.15.1.1808
Minecraft 1.8.9
StorageDrawers 2.6.4
BC 7.2.5

buildcraft checks for an inventory to connect to on block updates and when the pipe is placed down, i suspect that is to early for the drawer to have connected to the drawers and have an inventory.

other mods that have pipes that connect to inventories will most likely have the same issue, maybe having the controller trigger a block update when it changes from having no inventory to having one fixes it