'Collection has more than one element' when an RPC option contains a multi-value inlined map

[tejasna]

I'm encountering an issue where generateCommonMainProtos fails when an RPC option includes an inlined map with multiple values.

Wire Configuration
I have configured Wire to not generate services and applied the following options:

 kotlin {
    emitDeclaredOptions = false
    emitAppliedOptions = false
    rpcRole = "none"
}

Problematic RPC and Extension Option
This is the RPC and associated extension where generation fails:

  rpc Create(Request) returns (Response) {
    option (protobuf.ratelimit.limit) = {
      limits: {
        key: "key"
        value: {
          unit: "minute"
          requests_per_unit: 20
        }
      }
    };
  }

package protobuf.ratelimit;

extend google.protobuf.MethodOptions {
  MethodOptionsRateLimits limit = 50006;
}

message MethodOptionsRateLimits {
  map<string, RateLimit> limits = 1;
}

message RateLimit {
  string unit = 1;
  int64 requests_per_unit = 2;
}

The execution fails with the following error message:
> Collection has more than one element.

I believe the error occurs in this line, which seems to expect the inlined map value to have a single entry:
Options.kt#L391

Environment
Wire version: 5.3.1
Kotlin version: 2.1.0