v15.3.0-rc2 Can't publish content with first attempt

[PeterKvayt]

Which Umbraco version are you using? (Please write the exact version, example: 10.1.0)

15.3.0-rc2

Bug summary

Unable to publish content using block list while clicking "Save and publish" for first time. Next time it works like a charm.

Specifics

No response

Steps to reproduce

1. Fresh umbraco install
2. Create content type with property with block list (property must be mandatory)

3. Create node in content

4. Create a block list element for content

5. Click "Save and publish" first time

6. Reload the page and click "Save and publish" one more time

Expected result / actual result

Actual: An error notification occurred "Document could not be published, but we saved it for you" for a first attempt, the next attempts will succeed.
Expected: There is no error "Document could not be published, but we saved it for you " for first "Save and publish attempt".

[github-actions]

Hi there @PeterKvayt!

Firstly, a big thank you for raising this issue. Every piece of feedback we receive helps us to make Umbraco better.

We really appreciate your patience while we wait for our team to have a look at this but we wanted to let you know that we see this and share with you the plan for what comes next.

• We'll assess whether this issue relates to something that has already been fixed in a later version of the release that it has been raised for.
• If it's a bug, is it related to a release that we are actively supporting or is it related to a release that's in the end-of-life or security-only phase?
• We'll replicate the issue to ensure that the problem is as described.
• We'll decide whether the behavior is an issue or if the behavior is intended.

We wish we could work with everyone directly and assess your issue immediately but we're in the fortunate position of having lots of contributions to work with and only a few humans who are able to do it. We are making progress though and in the meantime, we will keep you in the loop and let you know when we have any questions.

Thanks, from your friendly Umbraco GitHub bot 🤖 🙂

[PeterKvayt]

@AndyButland
It seems that it is the similar issue as this issue

[AndyButland]

Thanks @PeterKvayt - I can reproduce. Not sure what's going on but I can see when I debug that the server is returning an "it's valid" response. On the client in I can see in UmbSubmittableWorkspaceContextBase here...

public async validate(): Promise<Array<void>> {
  console.log(this.#validationContexts);
  return Promise.all(this.#validationContexts.map((context) => context.validate()));
}

... that there are two validation contexts for the first case that fails, and then only one after you reload the item and successfully save and publish a second time.

I'll share this with the team so we can get it fixed.

[AndyButland]

Fixed via #18735 and due in 15.3.