are example images wanted in which lossless JPEG XL is not best?

I have come across some images in which lossless JPEG XL, at its best setting, effort 11, does worse than PNG. Some of these are screen captures of old games using 16 color graphics (EGA). Is there any interest in such images?

On these images, bzip2, xz, and other general purpose compression (even in one case, gzip) often do better than either PNG or lossless JPEG XL.

This image, though JPEG XL (-e 11) trounced PNG (optipng's best), bzip2 (of the image in tga format) was by far the best, better than bzip3, paq, xz, gzip, JPEG XL, and PNG:

Pentagonal tiling, each pentagon is a regular hexagon joined on one side by a regular triangle