Published page URI & national characters?

I’ve had a test run:

  • Set default locale to polski (or suomi)
  • Set slug generation method to ‘encoded’
  • Enabled enable page publishing

  • Created topic with title ‘Jeśli nie sałata to nie żaba’ (or ‘Jäällä öljyä vanhassa Åbossa’)
  • Topic slug generated /t/je%C5%9Bli-nie-sa%C5%82ata-to-nie-%C5%BCaba/758 (or /t/j%C3%A4%C3%A4ll%C3%A4-%C3%B6ljy%C3%A4-vanhassa-%C3%A5bossa/759)

  • Attempt to publish topic with the encoded slug je%C5%9Bli-nie-sa%C5%82ata-to-nie-%C5%BCaba as the URL
  • Can’t publish as URL contains invalid characters
  • Removing encoding allows page to be published

Alternatively…

It doesn’t seem like encoded slugs are supported for page publishing.

What’s expected here? I checked out both the Polish and Finnish government websites to see what their URLs are like, and they don’t encode theirs to account for this.

I’ve also had a search, and I don’t think this has come up as an issue before, which may make this Contribute > Feature request territory rather than a Contribute > Bug if they’ve never been supported.