ILateMixinLoader is not called because in 1.7.10 ASMDataTable does not collect interface implementations: https://github.com/FalsePattern/GasStation/blob/master/src/main/java/com/falsepattern/gasstation/mixins/mixin/LoadControllerMixin.java#L41.
When I ported the mixinbooter from 1.12.2, I didn't pay attention to it.
I have an idea how to fix this: we need to create an marker annotation that we will add to our ILateMixinLoader implementation class.
If you have a better idea, go ahead and implement it in your mod, and I'll do it in a mixinbooterlegacy.
Thank you.