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I’m having a very similar issue. I’ve got a menu built out using a lot of custom fields and repeaters. Initially our issue in AC4 was that when you would click update it would take a long time to load then refresh and the new fields we had added would be gone. We upped max_input_vars and about every other PHP value I could think of.
So I was hoping the upgrade would fix our saving issue, but it seems to have cropped up a different one. Now when I try to save I get the same “Uncaught TypeError: Cannot read property ‘length’ of undefined” error in load-scripts.php. This seems to go away when I delete some data / fields, but crops back up when I try to add it back in. Any suggestions?
Scratch the question. The database urls didn’t get changed out so it wasn’t pulling in the input.css that has the acf-hidden class. Just needed to change the wp_options table.