AMP Template Insider Issue - MAPCLUB

### Description

MAPCLUB had already requested AMP, and the request was approved successfully. After that, we conducted several rounds of testing to ensure everything was working as expected. At the beginning, the tests were running smoothly and we were able to see the AMP emails displayed correctly.

However, in the middle of our testing process, the functionality suddenly stopped working. The AMP content could no longer be displayed properly, and in the test email we received an error notification stating: “error displaying dynamic content (invalid_amp).”

This means that although the setup was initially working, something caused the AMP to fail during subsequent attempts. We’re currently reviewing what might be causing the inconsistency so we can identify whether it’s a technical issue in the AMP setup, validation, or rendering process.

### Reproduction Steps

https://github.com/user-attachments/assets/78d46252-d3da-4109-af08-7a5a13c3efd0

### Relevant Logs

```shell

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### Browser(s) Affected

_No response_

### OS(s) Affected

_No response_

### Device(s) Affected

_No response_

### AMP Version Affected

_No response_

The issue provides only an attached reproduction and no repository files, tests, or entry points. Start by reproducing the invalid_amp error from the attachment, then trace whether the failure is in AMP setup, validation, or rendering; done means identifying a reproducible cause and verifying that AMP content displays correctly again.

Written by the indexing model from the issue text.