Exported HTML spaces are not working correctly when titles of pages includes a regional character (ěščřž)

When using a special characters while labeling a pages (ěščřžýá), this character is incorrectly interpreted while naming HTML files with page content. The links from parent document to these files is not working then.

I would like to ask changing the naming convetion for exported HTML pages (e.g. page#####.html) or providing an option to set it in this way to prevent this issue.