WordPress API error when trying to add tags

[fanmerch2016]

In this video- ​https://www.loom.com/share/6671fc834c624e37940ba9ecf0398389 you can see that, even with all plugins deactivated and with a default theme, there is an error whenever we tried to add a new tag. As you can see in the video, there is a 400 server error related to the WordPress API.

Maybe it is showing due to - WordPress API error when trying to add tags that already exist to a existing post or within site.

I’ve run into an error in the browser console whenever I try to add tags (that already exist on the site) to a post. I’ve managed to reproduce this on a completely new site.

To reproduce this, please try the following steps:
1) Create a few tags (around 5-6) under Posts > Tags.
2) Create a new post.
3) With the browser console open, start adding your tags to the new post.
4) You should see a 400 Bad Request error for /wp-json/wp/v2/tags?_locale=user

I was able to reproduce this error on a completely new WordPress 6.0.1 install.
We then tried to reproduce this issue on a completely new WordPress installation with no plugins and we managed to reproduce this problem. It looks like this is a problem in WordPress core and not in a plugin. The error seems to be triggered only when you try to add a tag that already exists on the site.

[azouamauriac]

Hello @fanmerch2016 welcome to core trac and thanks for your report, I'm unable to reproduce the issue you are reporting, but I noticed that you have a mu-plugin ​https://prnt.sc/E1EC3l1izAyp do you mind to remove it and run the tests again? it will be great if you can send a video tape of the new WP installation without any plugin on it.

Regards.

[marcanor]

Hi @azouamauriac ,

Please find a video on a completely new WordPress installation ​here.

As shown in the video, to reproduce this, please try the following steps:
1) Create a few tags (around 5-6) under Posts > Tags.
2) Create a new post.
3) With the browser console open, start adding your tags to the new post.
4) You should see a 400 Bad Request error for /wp-json/wp/v2/tags?_locale=user

I've attached the site info output from Health Check below.

[rafiahmedd]

Hi @marcanor,

I just tried to recreate this issue following your video but I can see it's working perfectly fine. Also, I tried updating an existing post. I am using PHP 7.4 & WP 6.0.1, let me know if there's any other way that I can reproduce the issue.

Thanks

[azouamauriac]

Hello, I was able to reproduce the bug.

To reproduce it, you must quickly validate the entry of new tags before the list of proposals appears. A solution I would suggest would be to block any new request as long as there is an old one that is not completed.

the ticket should be reported on ​https://github.com/WordPress/gutenberg/issues/new/choose.

[jhoysi]

Replying to azouamauriac:

Hello, I was able to reproduce the bug.

To reproduce it, you must quickly validate the entry of new tags before the list of proposals appears. A solution I would suggest would be to block any new request as long as there is an old one that is not completed.

the ticket should be reported on ​https://github.com/WordPress/gutenberg/issues/new/choose.

I can confirm this is the case:

1. Start a new post
2. Type in a tag name you know exists - hit enter immediately (before the suggestion can appear)
3. Console shows 400 bad request response