[5.x] Add existing field option doesn't work.

[benfeather]

Describe the bug

I'm unable to add an existing field to a new form:

https://github.com/verbb/formie/assets/43571410/c2d7265d-4006-488a-96d2-d6787d4ba1bc

There are no errors logged in the browser console. However, there are some depreciation errors in the logs that pop up when I try to add an existing field, so this may be related.

Here is the stack trace:

Steps to reproduce

N/A

Form settings

• Multi-page form: No
• Submission Method: Ajax
• Client-side Validation: Yes
• Custom Form Templates: Yes

Craft CMS version

5.1.2

Plugin version

3.0.0-beta.10

Multi-site?

Yes

Additional context

No response

[engram-design]

Fixed for the next release. To get this early, run composer require verbb/formie:"dev-craft-5 as 3.0.0-beta.10".

[benfeather]

That works, thanks!