Description

Problem: When switching networks, the token list is cleared. Preventing token import via search or autodetect.

Diagnosis: TokenListController.preventPollingOnNetworkRestart was true, which intentionally clears the token list on network switch. Prior to #23919, this setting would be set false when enabling token autodetection. But this code path no longer triggers.

Solution: Set the initial value of preventPollingOnNetworkRestart based on whether we need token lists.

Related issues

Manual testing steps

1. Open MetaMask
2. Enable token autodetection in settings.
3. Switch networks
4. Tokens should be autodetected
5. Click import tokens
6. The left search tab should autocomplete when you type token names

Screenshots/Recordings

Before

After

Pre-merge author checklist

• I’ve followed MetaMask Coding Standards.
• I've completed the PR template to the best of my ability
• I’ve included tests if applicable
• I’ve documented my code using JSDoc format if applicable
• I’ve applied the right labels on the PR (see labeling guidelines). Not required for external contributors.

Pre-merge reviewer checklist

• I've manually tested the PR (e.g. pull and build branch, run the app, test code being changed).
• I confirm that this PR addresses all acceptance criteria described in the ticket it closes and includes the necessary testing evidence such as recordings and or screenshots.