When I copy URL from existing Czech Wikipedia page

https://cs.wikipedia.org/wiki/Violka_vonná

and assign it to text in a document, the indicator in Hyperlinks panel turns red, but when I check it’s value by double clicking the link I find the same text in the Edit hyperlink field (copy and pasting the text from hyperlinks panel to text editor proves it’s identical). When I export the to PDF, resulting the link doesn’t work and (in pop up text) shows another link’s value

https://cs.wikipedia.org/wiki/Violka_vonn%C3%83%C2%A1

When I click the link in PDF I end up on nonexisting web page with yet another address

https://cs.wikipedia.org/wiki/Violka_vonná

Please help.