Search functionality for comments doesn't work in some cases

Sometimes, when I search for a particular text within the comments of a post, the app returns No search results found even if there are comments with that text. These comments can even be top level comments, that are clearly visible when you load the post comments and scroll down.

In one case, I found changing the search text's characters to all lowercase made the search function return the correct results.

Example

In this reddit post:

• Searching for Havertz returns No search results found.
  Refer screenshot 1 below.
• But, searching for havertz returns the correct results.
  Refer screenshot 2 below.

Screenshots

• Screenshot 1
  
• Screenshot 2
  

Start by reproducing the issue in the linked Reddit post, comparing searches for “Havertz” and “havertz” in the post comments. Then locate the comment-search entry point and verify that matching is consistent regardless of query capitalization; no file or test is named in the issue, so add or update coverage for this case.