[Bug]: Cannot connect to Blast network - "Error while connecting to the custom network."

### Describe the bug

When I try to add a custom network, Blast, to Metamask, I receive an error: "Error while connecting to the custom network."

### Expected behavior

I expect to successfully add the Blast network to my Metamask

### Screenshots/Recordings

### Steps to reproduce

1. Go to https://blastscan.io/
2. Scroll to the bottom and click "Add Blast Mainnet"
3. Metamask dialog opens, with the network details populated
4. Click "Approve"
5. Receive error: "Error while connecting to the custom network."

### Error messages or log output

```shell
Error while connecting to the custom network.
```

### Version

11.16.5

### Build type

None

### Browser

Chrome

### Operating system

MacOS

### Hardware wallet

_No response_

### Additional context

_No response_

### Severity

_No response_

Reproduce the failure by using blastscan.io in Chrome, selecting “Add Blast Mainnet,” and approving the populated MetaMask dialog. Compare the observed connection error with the expected successful addition of the Blast network; no source file or test is identified in the issue.

Written by the indexing model from the issue text.