ask the
VLDC9 creators on how they got the game save problem fixed.
excerpt release notes from VLDC9 releases from a text file-
Quote
V1.10 - First official release
v1.11 - Fixed palette in Divemissil's level
Fixed yellow level dot for Simple Patch
Remove exit enabled pipe in LucasRCD's level
Various stuff in SomeGuy712x's level
Removed time limit from switch palaces.
Removed F*** You from Streamside (because we can't have profanity
like that on an (illegal) ROM hack on the interenet in 2016)
Changed some names in the credits
Fix walking on OW after beating S.N.N.'s level
Small changes to the haunted OW map.
Fixed 3rd save slot.
Edit 1/16/2018: in the meantime, avoid playing & saving games in Mario C game slot, even with the final release of SMW the Princess Rescue that I tried out a week ago. game saves seem to only work with the first two slots (Mario A & Mario B) but not the third. the problem seems to occur with both the English version AND the Portugese version of the game.
in fact, the 3rd game save slot problem occured with
ALL December 2017 betas [12-8, 12-11, 12-17, etc.] and final releases as I've just tested them myself. the July 2017 beta version is the only version that did not have this problem.