ChatGPT Apps: Embedded UI no longer renders on web after agentic multi-step exploration

Ko_Sato · March 6, 2026, 4:49am

We’re building a ChatGPT App that lets users explore and view our own content.

Until a few days ago, a workflow like this worked on web:

GPT performs agentic multi-step exploration
It chains multiple data-only calls to resolve candidates/details
It then invokes a UI-rendering step to surface the result in chat

Now, the exploration/data steps still succeed, and the UI-rendering call also appears to be invoked, but the embedded UI never actually appears in the web client.

The key pattern is:

data-only exploration succeeds
standalone UI rendering works
UI rendering after sequential exploration calls no longer surfaces on web

So this does not look like a retrieval failure. It looks more like a regression in the handoff from multi-step exploration to embedded UI surfacing.

Also worth noting:

Web: embedded UI does not appear
Mac desktop: still behaves as expected

Has anyone else seen a recent change in ChatGPT Apps where the UI-rendering step is invoked but the embedded UI does not render after agentic multi-step exploration, specifically on web?

Ko_Sato · March 6, 2026, 9:55am

same

React Error

[Error] Error: <unknown>: unexpected nullish value: undefined
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D7e — 1a7ebd5f-fplil4im46jkupp5.js:2:1204435
（anonymous関数） — 4813494d-kc23s1zx0z84qot3.js:2:3736
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hp — 2340486e-pfdnhg9jt0indmad.js:1:75559
Lp — 2340486e-pfdnhg9jt0indmad.js:1:98528
LE — 2340486e-pfdnhg9jt0indmad.js:1:154377
LD — 2340486e-pfdnhg9jt0indmad.js:1:153421
fv — 2340486e-pfdnhg9jt0indmad.js:1:153251
CE — 2340486e-pfdnhg9jt0indmad.js:1:149779
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tc — 2340486e-pfdnhg9jt0indmad.js:1:160986
BE — 2340486e-pfdnhg9jt0indmad.js:1:161266
（anonymous関数） — 2340486e-pfdnhg9jt0indmad.js:1:162497

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amoywolf · March 6, 2026, 2:42pm

I met exact same issue yesterday, it didn’t work suddenly without any App code change.
I tried different Apps on both Chrome and Safari, got same issue.
It’s same today.

vholdix · March 6, 2026, 4:39pm

Seeing the same issue. Accessing my app through the ChatGPT mobile app is working for now.

coreyching · March 6, 2026, 10:53pm

We’re investigating an issue where widget rendering can fail when, in the same turn, the model calls list_resources and then call_tool.

A mitigation is rolling out now, and we’re monitoring while we complete a full fix. As a temporary workaround, retrying the request in a new chat may help in some cases.

Thanks for reporting this. We’ll share another update as soon as we confirm the fix.

coreyching · March 7, 2026, 7:26pm

We have shipped a fix. Please let us know if you still are seeing this error.

Ko_Sato · March 9, 2026, 6:57am

Confirmed it’s working now. Thanks for the quick response!

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