WP Rest API bugs when going from 5.11.4 to 5.12

I had some hours of debugging unexpected errors from 5.11.4 to 5.12.
Made a ticket on the acf-site, instead of here - but since I found this place now - it s better suited here.

The three big gotchas for me was this, when upgrading the plugin in our composer-file.

1. Acf Field Groups disabled the "WP Rest API" setting - even though they earlier was set to "true" - for each field group.

• this did break our site depending on the WP Rest API.

2. Data typing, json/acf field types
   Before v5.12, the value of a ACF Type "Number" with the value of 12345 - was represented in the JSON output as a string, "12345", and not 12345. This makes some strict data type checking and external code to have issues. v5.12 changed this.

Even if I do like this change - it will break many implementations.

3. ACF Field image
   This field return the numerical ID of the image-field. And this happens regardless of "return format" set on the field. And this for sure breaks external code, since it tries to load 745 instead of a url to the image.

No files, tests, or entry points are named. Start by reproducing the 5.11.4-to-5.12 upgrade and compare field-group REST settings, number JSON types, and image return values; done would require defining and verifying the intended behavior for all three regressions.