Hi!
In my case,
1) The Force Language in Custom Links option is set to NO.
2) This is the only link that does this. The rest links on the site do not have this behavior. Even in the same breadcrumbs: the first link to Home is okay, and the second – to the Blog page adds the language to it. How this particular custom link is different from others?
3) Where is it a place in TranslatePress settings to insert a hashtag? The breadcrumb links are generated by the Yoast plugin.