org.codehaus.groovy.ast.Parameter names do not reflect what is stored in the bytecode.
In this example project, I have 3 projects.
api - Has a single interface that is compiled with parameters=true
app - Has a single interface that extends the one in api and is compiled with parameters=true
processor - Has a single ast transform that fails compilation if any method parameters start with "param"
The parameter names for the interface in the api project do not reflect the bytecode when compiling the app project
The runnable example is available here and I've attached it below