Can anyone explain it?
The official docs for that function say it strips percent encoded characters.
- Checks for invalid UTF-8,
- Converts single < characters to entities
- Strips all tags
- Removes line breaks, tabs, and extra whitespace
- Strips percent-encoded characters
https://developer.wordpress.org/reference/functions/sanitize_text_field/
It looks like it’s stripped out %ad and it has nothing to do with instances or leading/trailing, that function doesn’t understand that it’s a CSV etc, % probably isn’t the best character to use for this.
Why just the %ad though? In this case it’s the URL encoded value for aka a soft hyphen, or ­.
See https://www.w3schools.com/tags//ref_urlencode.asp for a more comprehensive table.
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