[wp-trac] [WordPress Trac] #53682: tags (keywords) with umlauts don't get saved in german locale

[WordPress Trac]

#53682: tags (keywords) with umlauts don't get saved in german locale
---------------------------+------------------------------
 Reporter:  spielautomat4  |       Owner:  (none)
     Type:  defect (bug)   |      Status:  new
 Priority:  normal         |   Milestone:  Awaiting Review
Component:  Editor         |     Version:  5.7.2
 Severity:  minor          |  Resolution:
 Keywords:  needs-patch    |     Focuses:  administration
---------------------------+------------------------------

Comment (by costdev):

 == Testing Report 2 of 2 (Classic Editor)

 === TL;DR
 - `Gärten` is created with the `gaerten` slug.
 - `Garten` isn't created.
 - Issue reproduced.
 - Ticket is valid.

 === Env
 - WordPress: 5.8
 - PHP: 7.4.18
 - Localhost: WSL2 with Ubuntu 18.04
 - OS: Windows 10
 - Browser: Chrome 93.0.4577.82
 - Theme: Twenty Twenty-One
 - Plugins: Classic Editor
 - Custom scripts: none

 === Steps to Test
 1. Go to `Settings > General`.
 2. Set `Language` to `Deutsch`.
 3. Click `Save Changes`.
 4. Go to `Beiträge > Erstellen`.
 5. Add a `Title` in `Titel hier eingeben`.
 6. Copy and paste `Gärten, Garten,` into the `Schlagwörter` meta box.
 7. Click `OK`.
 8. Click `Veröffentlichen`.

 === Results
 - In the `Schlagwörter` meta box, only `Gärten` appears.
 - In `Beiträge > Schlagwörter`, `Gärten` is added with `gaerten` as its
 slug.
 - In `Beiträge > Schlagwörter`, `Garten` is not added.

 === Notes
 - The order of `Gärten` and `Garten` does not matter when added as tags,
 the result is the same.

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Ticket URL: <https://core.trac.wordpress.org/ticket/53682#comment:15>
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