Put the summary of the bug you're having here
What I expected to happen was...: A pillar of scaffolding
What actually happened was...: Scaffolding moves up one block when clicked with another scaffolding block, instead of just keeping all of the blocks.
Describe what happened here
Steps to Reproduce:
1. Make the first picture's structure
2. Add scaffolding on the bottom block 4 times
3. Add scaffolding in the middle of the pillar around 4 times.
4. Add Scaffolding on the top of the ghost scaffolding to make it disappear
Please check if that's still an issue for you in the latest 1.15.1 stable release.