The Bug:
Ghost blocks can occasionally be created when placing scaffolding too quickly.
Steps to Reproduce:
Place down some scaffolding really quickly.
Take note as to whether or not ghost blocks can occasionally be created when placing scaffolding too quickly.
Observed Behavior:
Ghost blocks can occasionally be created when placing scaffolding too quickly.
Expected Behavior:
Ghost blocks would not be able to occasionally be created when placing scaffolding too quickly.
Related issues
is duplicated by
relates to
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Can confirm. This can be easily reproduced by changing your controls to use a keyboard key instead of a mouse button to place down blocks. When holding down that key while building scaffolding, the issue occasionally occurs.

I can confirm this is still an issue on 19w41a.

Confirmed for latest snap - 20w18a

Confirmed in 1.16 pre-release 7
when a flying scaffolding is updated, he disappears but don't drop item
edit: but place a ghost scaffolding don't use item

Confirmed in 1.16.3 and 1.16.4 Release Candidate 1
In the 1.16.4 Release Candidate, if you click fast enough, you can create multiple ghost blocks.

and my report is gona be a copy

in 20w51a
Can confirm in 21w03a.

I can confirm for 21w05b

in 21w06a

I can confirm for 21w07a

I can confirm for 21w08a

I can confirm for 21w10a

I can confirm for 21w11a

I can confirm for 21w13a

I can confirm for 21w14a
I'd like to request ownership of this ticket since the current reporter has been inactive since April 2019. I'm willing to provide all of the necessary information and will keep this report updated.

I can confirm for 21w15a

I can confirm for 21w16a

I can confirm for 21w19a

I can confirm for 21w20a

I can confirm for 1.17 Pre-release 1

I can confirm for 1.17 Pre-release 2

this is also in 1.18 pre-release 2

you can also by the way move the ghost bocks around by right-clicking while holding scaffolding in your main hand which is pretty weird.
I posted my videos to check that out

This is in 1.18 pre-release 3

confirm for 1.18 pre-release 4
also, you can use them as normal blocks and stand on them in survival mode and if you use the keyboard buttons instead of mouse buttons then you can create a big giant line of ghost blocks without needing support

can confirm for 1.18 pre-release 5

Mojang knows about this report but still hasn't fixed this for some reason.

Had a couple players kicked for flying while using scaffolding on my 1.18.1 server.
Both times players logged back in to have fallen to their deaths

Unable to reproduce, even with auto-clicker.
I think this issue depends on hardware read/write speed.

Not sure but fixed on 22w11a due to improvement MC-219875
This issue was present in 1.18.2, but no longer occurs in versions above or equal to 22w11a . With this being said, this issue has been fixed in 21w11a.
I tried to reproduce this in 22w11a for over ten minutes while having placed over 500 blocks of scaffolding without success. In 1.18.2, I was able to reproduce this problem within seconds, so I'm confident in saying that the issue here has been resolved in 22w11a.