Order Custom Field is saved twice if added prior to clicking create

[jacoswan]

Prerequisites (mark completed items with an [x]):

• [x] I have carried out troubleshooting steps and I believe I have found a bug.
• [x] I have searched for similar bugs in both open and closed issues and cannot find a duplicate.

Describe the bug When adding at least two Custom Fields to an order before the order has been created/saved for the first time, the first Custom Field duplicates. This happens whether or not a customer has been assigned, or products have been added.

Can recreate on 5.6.0 and 5.7.0-rc.1

Expected behavior Would expect the first custom field not to be saved twice, just once.

Actual behavior The first custom field is saved in duplicate.

Steps to reproduce the bug (We need to be able to reproduce the bug in order to fix it.) Steps to reproduce the bug:

1. Go to Orders » click Add Order
2. Add the first custom field (can be new or existing) » Click Add Custom Field
3. Add a second custom field (can be new or existing) » optionally click Add Custom Field
4. Click Create
5. Notice that the first custom field entered has been saved twice

Screenshots

Each of the custom fields in this screenshot was added only once, yet after clicking create it appears like so:

Isolating the problem (mark completed items with an [x]):

• [x] I have deactivated other plugins and confirmed this bug occurs when only WooCommerce plugin is active.
• [x] This bug happens with a default WordPress theme active, or Storefront.
• [x] I can reproduce this bug consistently using the steps above.

WordPress Environment We use the WooCommerce System Status Report to help us evaluate the issue. Without this report we won't be able to fully evaluate this issue.

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See: How to create a child theme WooCommerce Support: ✔ ### Templates ### Overrides: – ### Action Scheduler ### Complete: 99 Oldest: 2021-09-06 11:25:44 +0200 Newest: 2021-09-09 08:56:37 +0200 Pending: 6 Oldest: 2021-09-09 08:58:55 +0200 Newest: 2022-09-21 15:38:31 +0200 ### Status report information ### Generated at: 2021-09-09 08:59:06 +02:00 ` ```

[vinodglobalstep]

Hi @jacoswan ,

Thank you for taking the time to report this bug, we really appreciate your help. I can reproduce it on my end using WooCommerce 5.6 version.

Here's the screenshot:

Priority of this issue will be assigned shortly after we’d go through a round of prioritization. Please note it may take a couple of days.

[79mplus-admin]

This issue is in WordPress. It happens for any post type.

[79mplus-admin]

A ticket was created in WordPress and a patch was submitted.