Issue: Message Thread Navigation Inconsistency After Regenerating Responses

[sunglow666]

Description

When interacting with multiple AI models in a chat session, there is inconsistent behavior in message thread navigation after regenerating responses.

Steps to Reproduce

Screen.Recording.2026-02-06.at.16.32.02.mov

1. Start a chat session with 3 models: DeepSeek-V3.1, claude-sonnet-4-5, and GLM-4.7
2. Send first message: "hi" → All 3 models generate responses (first set)
3. Send second message: "who are u?" → All 3 models generate responses to this message
4. Regenerate responses for the first message ("hi") for all 3 models → Each model now has 2 responses for the first message
5. Navigate through the response history of the first message:
   • For DeepSeek-V3.1 and GLM-4.7: When switching between response versions (1→2→1), the second message thread ("who are u?") becomes invisible. It only reappears after page refresh.
   • For claude-sonnet-4.5: When switching between response versions (1→2→1), the second message thread remains visible normally.

Expected Behavior

• Consistent visibility of subsequent message threads regardless of which model's response history is being navigated
• No requirement to refresh the page to restore missing message threads

Actual Behavior

• Inconsistent behavior between models: 2/3 models lose visibility of subsequent message threads during response history navigation
• Requires manual page refresh to restore proper chat thread display