Cannot set *Message Type* when using `protobuf`

Proxyman version?

Version 2.13.0 (21300)

macOS Version?

Version 11.0.1 (20B29)

Steps to reproduce

I have a photo file like this:

syntax = "proto3";

package example.api.feeds.v2
import "google/protobuf/any.proto";
option go_package = "git.example.com/api/feeds/v2;v2";
option java_multiple_files = true;
option java_package = "com.exaple.api.feeds.v2";
option objc_class_prefix = "FeedsV2";

service Feed {
    rpc list(Req) returns (Reply);
}

message Req {
    int32 page = 1;
}

message Reply {
    repeated ListItem items = 1;
}

message ListItem {
    string content = 1;
}

And then I'm trying to parse the response which is encoded as protobuf. Here is the settings:

1. I add the photo file:
   

2. I cannot set the message type:
   

All I can find in the drop-down list of Message Type are like "google.protobuf.*".

Expected behavior

I can find the message type correctly.

Start by reproducing the issue with the supplied .proto schema and checking the Message Type selector after importing it. Trace how user-defined message types are discovered and compare them with the listed google.protobuf.* types. Done means the Feed messages, including Req, Reply, and ListItem, appear as selectable message types.