Hi
I don’t have much experience with WordPress, but I will try to answer the questions.
Could you please share how those fields were created – were they created in the UI or via PHP functions like acf_add_local_field_group() / acf_add_local_field() ?
I think they created in the UI. I can edit them in the UI.
Also, is the code in the screenshot you provided part of your theme or in a custom plugin?
The code in the screenshot part of my theme (located in the folder /wp-content/themes/).
Also, the update broke similar code everywhere in the theme.