Look here:

                // If this actor runs in interpreted mode, then actor method should not be compiled.
                // Allow run loop to be compiled with the best compiler available.
                if (CompileMode.isInt(cm, a)) {
                    pw.println(" {");
                    pw.println(" match: \"+" + task.name + "::" + an + "\",");


The "+" sign there is a copy-paste error from a relevant "inline" block. But "+" makes no sense in "match", and it would always mismatch. That means the "interpreter" split configuration are actually compiling.