Cannot replace search highlight tags with exportCallback()

I'm trying to remove the markup that gets added to an exported field value when the search highlighting triggers. For example:

If I perform a search for Hoeger and export the results, my CSV cell data contains:

Hermann-<span class="bg-yellow-100">Hoeger</span>

So I try to perform a str_replace() on $value using the exportCallback() method like so: ( a more obvious example below )

->exportCallback(function ($value) {
     Log::info($value);
     $value = str_replace('span', 'moo', $value);
     return $value;
}),

It just doesn't replace any part of the markup. The str_replace callback works on all other characters in the string, except the search highlight markup. What am I missing? Whats even more confusing is that I'm logging $value and the log file contains the vanilla value without any markup.

Start with the exportCallback() path and the search-highlighting path, using the reported CSV value and logging behavior as the reproduction. Trace where the highlight markup is added relative to the callback, then verify that the callback can modify the complete exported value and that CSV output no longer contains the unwanted tags.