If attributes passed to responsive_image have mixed destinations, one or the other will not show up.
Pass a mixture of attributes to a responsive_image element, some of which are configured to be placed on <img> and some of which are not. For example:
[
'itemprop' => 'foobar',
'data-my-attribute' => 'my value',
]Either only the <img> or only the <picture> attributes will actually be passed to Twig.
In media_helper_preprocess_responsive_image() there is a foreach loop that sets $tag_attributes = NULL near its beginning. This variable is assigned to a reference and potentially re-used across cycles. It needs to be unset() at the end of the cycle so that the beginning of one cycle does not clobber the other.
Fixed
2.0
Code
Issue #3455518 by bvoynick: If attributes passed to responsive_image...