### Description

**Expected behavior**: Display Mustache templates nested within `amp-carousel`. Font size of text content should be adjusted using `amp-fit-text`

**Current behavior**: Text content is not being rendered or displayed at all - just blank spaces are showing. `amp-fit-text` is running into display issues with `amp-carousel` in this specific use case.

### Reproduction Steps

1. Paste the AMP email code below into [AMP playground](https://playground.amp.dev/?mode=Responsive&runtime=amp4email#):

```html

body{visibility:hidden}

h1 {
margin: 1rem;
}

amp-fit-text rendering issue:

{{title}}
{{url}}

```

2. Click on the `amp-carousel` arrows and cycle through content; `amp-fit-text` content is not being displayed at all:


4. Use Chrome's Inspect Elements tool to reveal that the text content in the boxes is actually being rendered ("AMP YouTube Channel" in this case):

```html

```

However, it is assigned a class of `i-amphtml-fit-text-content` and being hidden:

```css
.i-amphtml-fit-text-content {
z-index: 2!important
visibility: hidden!important
}
```

5. Removing `visibility: hidden!important` will display the intended content but **without any font size adjustments**:


6. The text content in `amp-fit-text` will display properly if `amp-carousel` is removed completely from the original AMP email code:

```html

body{visibility:hidden}

h1 {
margin: 1rem;
}

amp-fit-text rendering issue:

{{title}}
{{url}}

```


HTML code for "AMP YouTube Channel" box:

```html

```

**Conclusion**: `amp-fit-text` is running into display issues when nested with `amp-carousel` in this specific use case.

### Relevant Logs

_No response_

### Browser(s) Affected

Chrome

### OS(s) Affected

_No response_

### Device(s) Affected

_No response_

### AMP Version Affected

_No response_

Reproduce the nested amp-fit-text, amp-list, amp-mustache, and amp-carousel case in the linked AMP Playground, then compare it with the example where amp-carousel is removed. Inspect why the generated content is hidden and whether font sizing runs in the carousel case. Done means the Mustache content is visible inside amp-carousel and still receives the intended font-size adjustment.

Written by the indexing model from the issue text.