ASM transformed class not behaving

[planetguy]

Recently I've been annoyed by portals in the overworld creating portals in the nether that could not under any circumstances lead back to them. I fixed it with a base-class edit, but that doesn't have the clean distribution coremods allow, so based on some examples, I made it into a coremod. I change a variable definition from a constant to a call to my mod's function. The function is properly called, but the constant from vanilla is still used (I checked by adding a print statement to the class, and it doesn't match what my function returns.)

Source code:

https://github.com/planetguy32/Gizmos/blob/master/planetguy/portalmod/NoCrosslinkASMTransformer.java