State not visible on playground.amp.dev

### Description

Here is the url:
https://playground.amp.dev/?runtime=amp4email&mode=Responsive&url=https%3A%2F%2Fpreview.amp.dev%2Fdocumentation%2Fexamples%2Fcomponents%2Famp-bind.email

This is the example of amp-bind but when I click on state to view the state, the loader continuously loads and state is not shown there


### Reproduction Steps

https://playground.amp.dev/?runtime=amp4email&mode=Responsive&url=https%3A%2F%2Fpreview.amp.dev%2Fdocumentation%2Fexamples%2Fcomponents%2Famp-bind.email

### Relevant Logs

_No response_

### Browser(s) Affected

Chrome, Firefox

### OS(s) Affected

Ubuntu 20.04, Windows 10

### Device(s) Affected

_No response_

### AMP Version Affected

_No response_

Start with the provided playground.amp.dev reproduction URL and inspect the state panel while loading the amp-bind.email example in AMP4EMAIL mode. Reproduce the continuous loader in Chrome or Firefox, then trace the playground state-viewer flow; done means the example's state is displayed instead of remaining in a loading state.

Written by the indexing model from the issue text.