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.
For me every time it runs into the block it switches directions. Did I insert something incorrectly? I mean I have the block but it behaves slightly different then the thumbnail.
Edit: ok i fixed it, this was on lunar magic's end; even though it has the behavior of a Rex Manipulation Block, it can't be set to act as 130, it has to act like 25 since it will be solid if the default is a cement block, if that makes any sense.
Tested with: LM 3.11, GPS 1.4.1, SA-1 1.32, Snes9x 1.60. Works as intended, so accepted. During moderation I fixed an issue where jumping on the rex and then making it normal again with this block would keep the rex clipping as if it were still smushed.