Unable to upload avatar in XF 2.3 with image optimization enabled

Just upgrade to XF 2.3 and activated image optimization. I cannot upload this simple PNG image, it ends up with the following error:

Oops! We ran into some problems.
Provided file is not a valid image.
Click to expand...

It works perfectly if image optimization is disabled.
I'm using PHP-8.3.10.
I do not know if this has an impact but I have the issue whether I choose built-in GD or Image Magick. Imagick does have webp support.

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