The hidden fieldtype (label and value) are always visible in submission email

[j3ll3yfi5h]

Bug description

Currently every field (label and value) lands in the default form submission email.

Doesn't matter if it's:

• type: hidden
• input_type: hidden
• listable: hidden
• visibility: hidden
• hide_display: false

We're using a field with type: hidden for doing some turnstile spam protection, but the client receives then something like: Cloudflare Turnstile Response: 0.PiYCjjqiZhCSotPBhhQcQbcoEyRH0tOmLbHT4zguCx2DkeAsnbJHKi7H42P_Z8-5jG62mZdWj-rF1wa7hnvGnRJbHcwODlZglX4nNhINbUb0yBfej31vW6sqpYFZRxN2Tnfw8SivPPYyJLuedcIAreJvScjztpwCJix0tdeYA2L_4euXx06HUzepy2fg95QfAofSe8qfLXDYgw1lMDbpT6PR8brVGkuvk7mdV6see2NmMdSxqvtUJgaEQ0k6a6i3SU8fLww_hY26QOCbhxTlcQ93yfWgiJxOGzKl9kQQLZHT0w7jsvmCU6xfUOQVUWAbjSaNifNxNq3GlFK0KzCC3hoO5m5FBxm7FVOcE7g_i0DUOb7tWNRaRBs1Yg37FnvECJDa-ILBSAycS9Z4HUV_C823JOeNetWXFV7Ii9BVs4fJmMEqf3F9h29lHMLX0MJR.Rlp-nIqvtHyIln4-vVToXg.4ef4a0fa7a4bd5d31dd758b82a4b697e5cb16d8e933af3affbc4fe42a1ea4c4e

I'm not even able to unset the field value in a listener and prevent the appearing, the clients still receives the label.

Also not adding it to the blueprint is not possible, because fields not existing in blueprints are ignored. (apart from the ones added by statamic, e.g. _token)

How to reproduce

1. Create a form
2. Add a field with type: hidden
3. Fill out form and submit it
4. Have a look on the form submission email

Logs

No response

Environment

Environment
Application Name: Statamic
Laravel Version: 11.10.0
PHP Version: 8.2.14
Composer Version: 2.7.6
Environment: local
Debug Mode: ENABLED
URL: statamic-fieldtype-hidden.test
Maintenance Mode: OFF

Cache
Config: NOT CACHED
Events: NOT CACHED
Routes: NOT CACHED
Views: CACHED

Drivers
Broadcasting: log
Cache: statamic
Database: sqlite
Logs: stack / single
Mail: smtp
Queue: sync
Session: file

Statamic
Addons: 0
Sites: 1
Stache Watcher: Enabled
Static Caching: Disabled
Version: 5.7.3 Solo

Installation

Fresh statamic/statamic site via CLI

Additional details

No response

[j3ll3yfi5h]

To not introduce a breaking change, maybe adding a config value to define what to do with hidden fieldtypes in forms could be a solution?

https://github.com/statamic/cms/blob/5.x/config/forms.php

[j3ll3yfi5h]

The Spacer Field also ends in the Form Mail 😢

[duncanmcclean]

The Spacer Field also ends in the Form Mail 😢

Fixed in #10710.