Debugging mixin methods' calls

Hello, I am using sponge’s mixin API, and I am having some issues. When I run my mod in the development environment everything works normally, but when I run it on the production environment the mixins seem to not be working. Is there anything I can do to debug this further? I have tried to enable the -Dmixin.debug flag but still seems too little for me to figure it out. The log does not output any error.

Are there any error messages, or are your Nixon’s simply ignored?