[2.0.20] Smart belt building doesn't replace ghost underground exits

[Leridon]

What did you do?
I manually placed belts over the ghosts I previously placed with a blueprint using smart belt placement. It's important to mention that I placed the power poles first.

before.png (2.34 MiB) Viewed 203 times

What happened?
The underground belt exits did not get placed, but remained as a ghost.

after.png (1.98 MiB) Viewed 203 times

What did you expect to happen instead? It might be obvious to you, but do it anyway!
The underground belt exits to be placed where there are ghost underground exits already. When removing the ghost completely and doing the same smart belt building, the results are as expected.

afterexpected.png (2.02 MiB) Viewed 203 times

Does it happen always, once, or sometimes?
Always.

More detail:
Here's the blueprint used in the example:

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Copy blueprint

I noticed this in earlier versions already, so this is not a new bug introduced by 2.0.20.

Maybe related to this report: viewtopic.php?f=7&t=121980

Reproducible in vanilla, without the expansion executable:

factorio-current.log

(6.37 KiB) Downloaded 9 times

[Genhis]

Thanks for the report, this is a duplicate of 118408.