Mapping checkboxes to ACF with CPT for Advanced post creation seems to be missing some steps so here
First in GF create the check box fields and then in ACF create the check box fields.
Then follow the example steps and add that function, gform_advancedpostcreation_post_after_creation - Gravity Forms
In GF, the bulk / predefined choices should have a name and value like this Yes-Please|Yes then in ACF you will add choices with a value and name like this Yes : Yes-Please, and I set the Return Value of the ACF checkbox to BOTH.
The function example GF provided can be used on multiple form fields without altering it. This will fill in the acf fields in a CPT without the need to map them in the advanced post creation addon.
I don’t know why the APC addon can’t figure this out on its own but it never has been able to do it.