Hey @elliot I really thank you very much for following this up.
Just to leave clear what the real issue is, its not about the shortcode not printing the form when inserted through an ACF field -because it does- but that the form fails to submit.
I also created a support topic for the Jetpack plugin in the WordPress repository: https://wordpress.org/support/topic/jetpack-contact-form-shortcode-not-working-when-inserted-via-a-custom-field?replies=1
…but still waiting for a reply.
I do think that due to the relevance of both plugins -ACF and Jetpack- this issue shouldn’t be consider as a minor issue.
