Regular Expression Validation becomes /[object Object]/ after the first submission in the Edit Form

[tsh]

Demo version:

I can replicate the issue following the steps below:

1. Log on and go to the form (https://a_8hwne7u84ho.v13.demo.nocobase.com/admin/d40z6b4643t/view/3f20a0c6edf/filterbytk/338411374444544)
2. Edit the Study ID and then submit
3. Log out
4. Log on and go to the form again
5. Edit the Study ID and the regex validation becomes /[object Object]/