At https://www.mediawiki.org/wiki/Topic:V80l64inuhz2rhyt a user reports the ~~~~ wiki syntax not being expanded in the preview. Luckily this is only a visual inconsistency. After actually importing the file, the syntax is expanded (as expected) on the resulting file description page.
Note this is not only about the ~~~~ syntax, but about all pre-save transforms.
- Pre-save transforms are applied in the preview.
- On the resulting file description page, the syntax is expanded as before.
- Import any file.
- Edit the file description.
- Add ~~~~.
- In the preview, this should be expanded to the current users name.