Construction signposts with no materials in them staying up

[twincannon]

Pretty minor but just stumbled upon this one by accident. You can leave behind construction signposts with 0 of all materials in them if you move away from the signpost the instant you place it down.

Example video: https://streamable.com/osbm2

Repro:
1) Bring up a cursor to place a buildable object
2) Click to place the signpost to begin construction
3) At the same time the signpost is placed, move away

Notes:

• I'm running Amber client in this video but confirmed it works and carries over with the classic client (i.e. these aren't just clientside ghost GOBs)
• The signs disappear as normal if you open them and then walk away without putting any materials into them

[jorb]

Yeah, I've seen this myself. Made a note to look at it, but minor.