Jetpack Search - Superscripted Text Not Found

### Impacted plugin

Jetpack

### Quick summary

Creating a new issue for this closed bug: https://github.com/Automattic/jetpack/issues/37646 since it is still reproducible.

Superscripted text cannot be found in search. The issue was reproducible only on Simple site.

### Steps to reproduce

1. On a Simple site, create a new post or page with superscript text and non-superscript text.
2. Search for a text snippet that includes the superscripted text.
3. Note that the post is not found.
4. Search for a text snippet without superscripted text.
5. Note that the post is found.

Screen recording:

https://github.com/user-attachments/assets/3a91ed40-b9ee-46c0-97c5-4c81820f4490

### Site owner impact

Between 20% and 60% of the total website/platform users

### Severity

Moderate

### What other impact(s) does this issue have?

_No response_

### If a workaround is available, please outline it here.

_No response_

### Platform (Simple and/or Atomic)

Simple

Start by reproducing the issue on a Simple site using the listed steps, then trace Jetpack Search's handling of post content containing superscript text. Done means a search for a snippet that includes superscripted text finds the post, while the existing non-superscript search behavior remains intact.

Written by the indexing model from the issue text.