Failed "eventAction: artifact" disappears from the trace after browser refresh.

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Assessment

This issue has not been assessed yet.

Description

Describe the bug
This problem is related to the main bug submitted as #3291.

After getting the described error

it becomes visible in the trace, as can be seen in the screenshot:

After refreshing the page or moving back and forth to a different session, the error event disappears from the trace:

Expected behavior
Trace shouldn't change or lose events when I move between sessions or refresh the browser window.

Desktop (please complete the following information):

• OS: Ubuntu
• Python version(python -V): 3.13.9
• ADK version(pip show google-adk): v1.17.0

Model Information:

• Are you using LiteLLM: No
• Which model is being used: gemini-2.5-flash

Getting set up

First steps

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4. Open a pull request that references the issue number.

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