Hi!
I had ACF conditions on buttons, on CPT layouts. They were showing/hiding those buttons based on the ACF toggle state.
Lower on the Layout I had sections that also responded to the same conditions. So if there is no section, there is also no button.
After updating to Beta 4, The conditions remained on the sections, but all conditions disappeared from buttons.
I manually copied the conditions from the sections to buttons, and everything is working now.
Thanks!