Click-to-call not working on Google AMP Viewer

### Description

From my mobile, when I access to my AMP website by searching it through Google, I'm sent to it in the Google AMP Viewer. I've a click-to-call button but it doesn't work (nothing happens when I click on it, sometimes it works by clicking many times on it).

If I access my AMP website by typing directly URL, I access my website and click-to-call works fine.

### Reproduction Steps

- Type "pharmacie de garde tours" in Google France on mobile
- Search for my website (pharmacie-degarde.com)
- Navigate on it
- Try to click the blue button in header, this should open your call app on your phone

### Relevant Logs

_No response_

### Browser(s) Affected

_No response_

### OS(s) Affected

_No response_

### Device(s) Affected

_No response_

### AMP Version Affected

_No response_

Start by reproducing the reported click-to-call failure in the Google AMP Viewer on mobile using the listed search and site flow, then compare it with direct URL access. Investigate the AMP Viewer-specific click behavior; done means the blue header button reliably opens the phone's call app in the viewer without breaking direct access.

Written by the indexing model from the issue text.