Tip: Remaking levels from other Mario games is strongly discouraged, especially popular ones (World 1-1 from SMB or SMB3, for example), as their over-presence in Mario games, official or not, often makes them uninteresting to play.
This patch fixes the bug with being able to climb on nothing if you're pushed off a line guided rope. Also, fixes the bug where the ropes will keep carrying you for a while if you get onto the ground while climbing on them.
There are options to enable or disable the fixes at will. This patch previously lacked SA-1 support and was two separate patches. The original version is backed up here.
The Ground Fix has a bug. If you run on the ground against a rope's intended path and grab the furthest pixel of it, it causes the Air Climb bug, although this setup doesn't work in vanilla. I'm hoping for an alternative or an update!