Hello!
I know it is probably too late to do anything about this. But I'm gonna put my two cents in anyway.
I have played the game in order up to the fifth Shine of Rainbow Ride. I have lost hundreds of lives in this area and had a few Game Overs. I've noticed a few things about this area.
[list=][*]Losing a life does not cause coins or 1-ups to respawn in an area. However, Game Overs and exiting a level (usually) do. However, in the Secret of Triangle Tower, coins and 1-ups do not respawn even with a Game Over or exiting the level. They can be collected only once per game. This is also true of the single 1-up mushroom in the secret passage in Peach's Castle beside the Tropical Isles painting. This is possibly deliberate to force a challenge on the player with the platforming and the flying enemies and Bullet Bills in the last area of the secret course, just at the location of the Shine.
[*]Even if the first one was deliberate, this second one is clearly an accidental bug. It affects not only the Triangle Tower, but all areas of the game with enemies that fly horizontally. The flight paths of flying enemies are not consistent across plays of a level. This can make the Triangle Tower unplayable if Fly Guys are positioned above the wrong object.
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Thank you. Hopefully I can play SM63 again soon.
Stuart Simon