This issue was raised in https://wordpress.org/support/topic/args-passed-to-twig_array_filter-must-be-an-instance-of-twigenvironment/.

In this commit, they changed the parameters from

function twig_array_filter($array, $arrow) {}

to

function twig_array_filter(Environment $env, $array, $arrow) {}

Yes, they prepended a parameter. This now conflicts with the patch we introduced in Timber 1.14.0, in #2124 to be exact. The tricky thing would be to get the Twig environment in there. Or maybe we need to take a completely different approach.

@palmiak Any idea how we could solve this?