This bug report is a parity issue with Java.
Summary:
In the Java version, the following blocks cannot be installed on the powder snow, but in the bedrock you can.
Affected blocks: (I seem to have added everything, but if I missed something - write in the comments)
Ladder
Vine
Scaffolding[fixed in 1.17.0.54]Fire
Twisting vines
Steps to Reproduce:
Put the powder snow.
Take the above blocks.
Install the above units on the powder snow.
Observed Results:
The blocks will be installed.
Expected Results:
Blocks will not be installed on the powder snow.
Images:
affects 1.17.0.52