Custom networks missing after reinstalling or restoring from Secret Recovery Phrase

When you reinstall MetaMask, custom networks need to be re-added. This is because MetaMask essentially considers your wallet to be a completely new instance of the app, and will not retain any of the data that was previously stored locally — custom networks being one example.

You can easily re-add the networks that are missing using the instructions in the below articles:

• Add a network using Chainlist
• How to add a custom network RPC.