Can confirm in 1.20 Pre-release 6
Can confirm in 1.20 Pre-release 6. And also happens with comparators.
Can confirm in 1.20 Pre-release 6
Still not completely resolved in Minecraft 1.20 Pre-release 6 with scaffoldings. Scaffoldings are not included in the bug report. A duplicated bug report is MC-165067
With at least 4 scaffoldings, go to the top and hold shift at the edge of it to get fall damage.
Video of the bug being played in Minecraft 1.20 Pre-release 6: bug video
Can confirm in 1.20 Pre-release 6