Fedora system upgrade libtiff-devel-4.4.0-5.fc38.i686 collides with libtiff-devel-4.4.0-5.fc38.x86_64

Just as in the description. Those two packages from the system-upgrade collide in the file /usr/include/tiffconf.h

Remove the .i686 package to solve the collision.

I already found the solution somewhere else. Still, thanks you!

How did you solve it? I have the same error when trying to upgrade

I think you should just do what the post, which is marked as the solution, says.