p4c: P4-14 to P4-16 fails in getting parameters from extern instatiation

The P4-14 to P4-16 conversion is not getting the correct instatiation parameters. E.g:

Following P4-14 code:

parser start { return ingress; }
extern_type extern_test {
    attribute att_test {
        type: int;
    }
    method my_extern_method ();
}
extern extern_test my_extern_inst {
  att_test: 0xab;
}
action a() { my_extern_inst.my_extern_method(); }
table t {
    actions { a; }
}
control ingress {
    apply(t);
}
control egress {}

Generates:

#include <core.p4>
#include <v1model.p4>

struct metadata {
}

struct headers {
}

extern extern_test {
    void my_extern_method();
    extern_test();
}

parser ParserImpl(packet_in packet, out headers hdr, inout metadata meta, inout standard_metadata_t standard_metadata) {
    @name("start") state start {
        transition accept;
    }
}

control egress(inout headers hdr, inout metadata meta, inout standard_metadata_t standard_metadata) {
    apply {
    }
}

control ingress(inout headers hdr, inout metadata meta, inout standard_metadata_t standard_metadata) {
    extern_test() my_extern_inst;
    @name(".a") action a() {
        my_extern_inst.my_extern_method();
    }
    @name("t") table t {
        actions = {
            a;
            @default_only NoAction;
        }
        default_action = NoAction();
    }
    apply {
        t.apply();
    }
}

control DeparserImpl(packet_out packet, in headers hdr) {
    apply {
    }
}

control verifyChecksum(in headers hdr, inout metadata meta) {
    apply {
    }
}

control computeChecksum(inout headers hdr, inout metadata meta) {
    apply {
    }
}

V1Switch(ParserImpl(), verifyChecksum(), ingress(), egress(), computeChecksum(), DeparserImpl()) main;

I believe there is an issue with the v1parser.ypp, but I feel a bit unconfortable to change it.