Bug report

phpstan gives error "Empty array passed to foreach." within an associative array with arrays as values, but those internal arrays are not empty.

Code snippet that reproduces the problem

https://phpstan.org/r/579c6091-9983-45ee-bcfa-54565c3d38be

Expected output

no error

Notes

Note that there are no errors if we replace
foreach ([0,1] as $i) {
by
foreach ([0] as $i) {

or if we replace:
$arr[$i] = [];array_push($arr[$i], "foo");
by
$arr[$i] = ["foo"];