To the OP, this generally happens when something in interfering with a query being done by ACF. It could be that another plugin was causing the issue or that it is a but in WP as @lukasfrei experienced.
The first thing that needs to be done is to narrow down the problem, update or revert WP, plugin deactivation, theme switching to figure out where the conflict is.
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After @keithdevon mentioned building out an accessible @wp_acf accordion block I went through my starter theme, setup a new site and just tabbed through it... try it, you'll end looking at your websites in a completely different light! Fully accessible navigation and content now.