Value/ListValue do not include the required dependencies when using nestJs=true

[dbettini]

For content-delivery.proto file:

syntax = "proto3";

package content_delivery;

import "google/protobuf/struct.proto";

...

message Test {
  // optional google.protobuf.Value data = 5;  // If this replaces the next line, it does not work
  optional google.protobuf.Struct data = 5;
}

Using Struct correctly requires the dependencies in the built content-delivery.ts, but does not if Value or ListValue is used.

The missing lines are as follows, the files otherwise being identical:

- import { wrappers } from "protobufjs";
import { Observable } from "rxjs";
import { ContentElement_MetaProps, Course, CourseMetaProps, Page } from "./content.pb";
- import { Struct } from "./google/protobuf/struct.pb";
 ...
+  data?:
+    | any
+    | undefined;
-   data?: { [key: string]: any } | undefined;
...
- wrappers[".google.protobuf.Struct"] = { fromObject: Struct.wrap, toObject: Struct.unwrap } as any;

As you can see, the types seem to be correct, but the import is not there.
This only happens with the Nestjs option - without it, the generated files are working, i.e. they only have expected differences (using Value. vs Struct).

EDIT: Also, it seems Struct is there only if it's part of at least one root message, but not if all messages containing it are nested:

message TestFirst {
  message TestSecond {
    google.protobuf.Struct dataSecond = 1;
  }

  TestSecond dataFirst = 1;
}

In this case, even Struct will not be correctly imported (again, only in the case of Nest plugin).
Should I open another issue for that, since it looks like a different problem?

Version: Initially tried on 1.156.6, then tried bumping to latest 1.166.2