Can not create merge commit when checks succeed

[yp05327]

Description

reproduce:
user A: site admin
user B: normal user

• user A: create an individual repo
• user A: add user B as a contributor with write permission
• user A: push some code to this repo with an action workflow
• user A: add a branch rule to main with
  push whitelisted (only user B), required approvals: 1, enable status check
• user B: create a new branch
• user B: create PR
• user B: push a commit to this new branch
• wait until required jobs finished with success status
  updated: important, if jobs are in pending, you will not get any error
• user B: click that blue button

Gitea Version

latest

Can you reproduce the bug on the Gitea demo site?

No

Log Gist

No response

Screenshots

No response

Git Version

No response

Operating System

No response

How are you running Gitea?

build

Database

None

[yp05327]

At first time you click the red button of this PR, it will display a flash error

After that you will see the blue button. It will show JSON error.