Found a bug (single-color jpg/png image)

Hello,

I’ve just uploaded your image and everything works correctly
https://wptest.kubiq.sk/wp-content/uploads/2021/02/plc.jpg
as you can see it is 2kb image/webp in Sources

also when I manually put it on FTP and run convert, then it works
https://wptest.kubiq.sk/wp-content/uploads/test/plc.jpg

But still – this image has really weird source code… normally it should be much smaller
Take a look, this is optimized version without webp
https://wptest.kubiq.sk/wp-content/uploads/test/plc-optimized.jpg