Here are all the settings regarding custom options.
Custom product options
Click Add Custom Settings Group button to add special product options in the Live Product Editor.
When you click the add item button to create custom options you will get these settings:
Group . . .
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V4.5.2 Live Product Editing
Custom product options disappear after a certain time.
Well that’s a key in the database, you could have deleted it by mistake.
help! how to add meta fields data? f.e. the field _price_types_1 ?