Using agentic chat on specific issue reliably creates problems

Problems

There are multiple issue + prompt combinations that somewhat reliably create problems

1. #388971

Note

This seems to be fixed with this update: &19253 (comment 2752634389)

First raised in https://gitlab.com/gitlab-org/gitlab/-/issues/568939#note_2740392597 and confirmed in https://gitlab.com/gitlab-org/gitlab/-/issues/568939#note_2741946920. Asking just "hi" on #388971 somewhat reliably leads to problems. Session 1112534 is evidence that it can also happen with other prompts

Related sessions:

1111187, 1111194, 1111918, 1112534

2. https://gitlab.com/gitlab-com/request-for-help/-/issues/3398

Asking for "Identify if any other issues in the request-for-help project could be related." or similar queries leads to problems.

The initial report shows a few tool calls occurring but then the session to break silently.

Reproduction tries (session ids 1112677, 1112591) rather show the following behavior:

1. After the user request is sent it shows a first answer (see screnshot)

2. The answer vanishes
3. Chat continues to work for some time, until it goes back to waiting for user input without any other error feedback
4. Going out of the specific chat and back in shows the generic There was an error processing your request. Please try again or contact support if the issue persists.

Does it also happen for other prompts?

Could not yet be reproduced reliably.

Hypothesis

Somehow the context from the page that specific page that's loaded into the agentic chat makes it more likely to break.