[Android/Quest3] Failed to parse Response because JsonSerialization: Cannot deserialize readonly or fixed size dictionary

[dudziakl]

Bug Report

I have copied SubmitChat method from ResponsesBehaviour.cs. Everything works fine in Unity Playmode on PC but when I build the app for the Quest 3 (Android) I have an exception in this EventHandler

com.openai.unity/OpenAI/Packages/com.openai.unity/Samples~/Responses/ResponsesBehaviour.cs

Line 130 in a81f086

async Task StreamEventHandler(string eventName, IServerSentEvent sseEvent)

Here is the sample from the logcat:

Failed to parse Response -> {
"id": "resp_68b1d5705eb081978ec5d182e7c2acfb0e006c82ec3a78a3",
"object": "response",
"created_at": 1756484976,
"status": "in_progress",
"background": false,
"error": null,
"incomplete_details": null,
"instructions": null,
"max_output_tokens": null,
"max_tool_calls": null,
"model": "gpt-4o-mini-2024-07-18",
"output": [],
"parallel_tool_calls": true,
"previous_response_id": null,
"prompt_cache_key": null,
"reasoning": {
"effort": null,
"summary": null
},
"safety_identifier": null,
"service_tier": "auto",
"store": true,
"temperature": 1.0,
"text": {
"format": {
"type": "text"
},
"verbosity": "medium"
},
"tool_choice": "none",
"tools": [],
"top_logprobs": 0,
"top_p": 1.0,
"truncation": "auto",
"usage": null,
"user": null,
"metadata": {}
}
Newtonsoft.Json.JsonSerializationException: Cannot deserialize readonly or fixed size dictionary: System.Collections.Generic.IReadOnlyDictionary`2[System.String,System.String]. Path 'response.metadata', line 1, position 731.
at App.FeedbackBehaviour.g__StreamEventHandler|9_0 (System.String eventName, Utilities.WebRequestRest.Interfaces.IServerSentEvent sseEvent) [0x00000] in <00000000000000000000000000000000>:0
at System.Runtime.CompilerServices.AsyncTaskMethodBuilder.Start[TStateMachine] (TStateMachine& stateMachine) [0x00000] in <00000000000000000000000000000000>:0
at App.FeedbackBehaviour.g__StreamEventHandler|9_0 (System.String eventName, Utilities.WebRequestRest.Interfaces.IServerSentEvent sseEvent) [0x00000] in <00000000000000000000000000000000>:0
at OpenAI.Responses.ResponsesEndpoint+<>c__DisplayClass7_0.b__0 (Utilities.WebRequestRest.Response sseResponse, Utilities.WebRequestRest.ServerSentEvent ssEvent) [0x00000] in <0

This issue looks very similar to #147 but it affects the Android build.

Response class uses IReadOnlyDictionary<string, string> so this might be the issue

com.openai.unity/OpenAI/Packages/com.openai.unity/Runtime/Responses/Response.cs

Line 36 in a81f086

[JsonProperty("metadata")] IReadOnlyDictionary<string, string> metadata = null,

I'm using Unity 6 (6000.0.038f)

The issue was mentioned in Unity forum without fix or workaround :(
https://discussions.unity.com/t/cannot-deserialize-dictionaries-anymore-on-android-builds-after-unity-upgrade/861980

Real-time session works fine. I didn't check the Assistant or Chat API yet.

[dudziakl]

I can confirm that changing IReadOnlyDictionary to Dictionary solves the problem. I made a PR for it #403