https://tcrf.net/Sonic_the_Hedgehog_3/Sonic_%26_Knuckles_Leftovers

Sonic 3: Death Egg Zone Act 2 object layout

Horizontal Vertical Object ID Variable Name
0550 0000 02 89 path swapper/collision change object (Invisible Rings - Vertical Switch)
0080 0080 00 00 Ring

This path swap object is not in Sonic 3: November 3rd, or Sonic 3: Limited Edition proto 0408. The path switcher is not in the final Sonic & Knuckles, either.

https://tcrf.net/Sonic_the_Hedgehog_3/Sonic_%26_Knuckles_Leftovers#Mushroom_Valley_Object_Data

Poor Madmole. Never stood a chance(In Sonic 3, anyway).