As described above, fields hidden by conditional logic are not submitted or updated. I didn’t build ACF and I can’t say if this will change, I just know the way it works and I don’t expect it to change.
You would need to submit a support request to get the developer’s input and that can be done here https://support.advancedcustomfields.com/new-ticket/.
If you want to use conditional logic for some other purpose than having conditional values then you need to look at some other way of doing this. For example, building custom JavaScript that will hide and show fields in some other way than using the built in condition logic functionality of ACF. You could hide and show fields in some other way that would allow the values of the fields to be submitted.
