Using MySQL 'utf8mb4' but getting "Malformed UTF-8 characters, possibly incorrectly encoded"

I have a project created in Laravel v10.48.20 and I'm using Laravel Nova v4.34.3 to show records.

I recently added some records with some German characters, and now the Nova resource is throwing this error every time:

Malformed UTF-8 characters, possibly incorrectly encoded

From the start of the project, I've had these settings in my config/database.php file:

'mysql' => ['driver'         => 'mysql',    // ...other settings...'charset'        => 'utf8mb4','collation'      => 'utf8mb4_unicode_ci',    // ...other settings...],

These UTF-8 chars shouldn't be causing this issue with the DB settings like this.

I ran this query to check our table to see if any values were incorrectly encoded and no results came up:

SELECT name FROM offers WHERE CHAR_LENGTH(name) != CHAR_LENGTH(CONVERT(name USING utf8mb4));

The PHP settings have default_charset = "UTF-8".

This is my Nova field:

Text::make('Name')    ->sortable()    ->help('The name of the offer.'),

What could be causing this issue?