Form not being posted when a file is attached (xamp localhost) - php

Question

I have a strange issue where a form is posted correctly when the file input is empty, but nothing is posted when I add a file.
My html:
<form method="post" action="create_product.php" enctype="multipart/form-data">
<?php echo display_error(); ?>
<div class="input-groep">
Homepage
<label>Product naam</label>
<input type="text" name="product_naam" value="<?php echo $product_naam; ?>" autocomplete="off">
</div>
<div class="input-groep">
<label>Beschrijving</label>
<input type="text" name="beschrijving" value="<?php echo $beschrijving; ?>" autocomplete="off">
</div>
<div class="input-groep">
<label>Prijs</label>
<input type="text" name="prijs" value="<?php echo $prijs; ?>" autocomplete="off">
</div>
<div class="input-groep">
<label>Afbeelding</label>
<input type="file" name="afbeelding" accept=".jpg,.jpeg,.png" autocomplete="off">
</div>
<div class="input-groep">
<button type="submit" class="homeknopdonker" name="register_product"> + Maak product aan</button>
Terug naar producten
</div>
</form>
When I submit the form without any values, I can see in my network tab the following:
product_naam:
beschrijving:
prijs:
afbeelding: (binary)
Above data is inside Form Data
However if I attach a file (small image) to the afbeelding input (file) the Form Data dissapears entirely from my network tab when I post it. The paramaters are nowhere to be seen and I get no errors when I turn on error_reporting.
What could be causing this?