turns out that code didn't work.

Themes/_fallback/Scripts/03 CustomSpeedMods.lua

@@ -1,12 +1,9 @@
 --[[
-Custom Speed Mods v2.2 (for StepMania 5)
+Custom Speed Mods v2.1 (for StepMania 5)
 by AJ Kelly of KKI Labs ( http://kki.ajworld.net/ )
 
 changelog:
 
-v2.2 (StepMania 5 Preview 3)
-* m-Mod bugfix from hanubeki.
-
 v2.1 (StepMania 5 Preview 2)
 * Added support for m-Mods.
 
@@ -270,18 +267,8 @@ function SpeedMods()
 
 		LoadSelections = function(self, list, pn)
 			local pMods = GAMESTATE:GetPlayerState(pn):GetPlayerOptionsString("ModsLevel_Preferred")
-
-			local isMMod = string.match(join(',',pMods), "m%d+")
-			if isMMod then
-				local mIndex = table.find(self.Choices, isMMod)
-				if mIndex then
-					list[mIndex] = true
-					return
-				end
-			end
-
 			for i = 1,table.getn(self.Choices) do
-				if table.find(pMods, self.Choices[i]) then
+				if string.find(pMods, self.Choices[i]) then
 					list[i] = true
 					return
 				end