Custom Register Validation

[kerorojason]

Hi all.
When I use custom register, my validation doesn't work! I've be debugging for over a week. Would appreciate your help!
https://codesandbox.io/s/trusting-mahavira-piq9p?from-embed

[bluebill1049]

it's important to leave steps to reproduce.
anyway i try to guess:

setValue("custom_field", e.target.value, true);