Before I test out any attached code, lets first rule out the possibility of your servers running our of memory / vars during the save proccess:
Can you please read over these related threads and try to increase your php settings to allow more data to be saved?
Welcome to the Advanced Custom Fields community forum.
Browse through ideas, snippets of code, questions and answers between fellow ACF users
Helping others is a great way to earn karma, gain badges and help ACF development!
2022 was a big year for Advanced Custom Fields, with more capabilities, a new generation of ACF Blocks, a refreshed UI, and a new home. Our year in review post looks at advancements we’ve made and offers a glimpse of the future.— Advanced Custom Fields (@wp_acf) January 6, 2023
© 2023 Advanced Custom Fields.