have you same problem (shortcode that did not work) with Contact Form 7 or some other plugin that use shortcode?
because i cant confirm any problem with ACF and shortcode. (not inside wysiwyg, nor inside textarea or textbox)
if you have same problem with Contact Form 7 too, then problem is maybe a filter, your template, or an other plugin that you use.
if Contact Form 7 has not the same problem then your slider-plugin/shortcode is the problem.
or maybe this help:
$slider = get_field('page_slider',$page->ID, false);
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