Folder name can not have special characters like %/\:*?"[]| . #{}^;+, space [You might have added this folder via WebDev]
Can you please %encode the URL while providing and check?
like -> b edroom as b%20edroom
Some more workaround:-
You can add x-cq-linkchecker="valid" parameter in the <a> tag to make sure that links are always marked as valid by AEM. In this case, link checker will check the link but will mark it valid.
Or
You can disable external link checker entirely by going to felix console

OR
You can ass context and x-cq-linkchecker="skip" to the a tag as below then url would rendered correctly like:
<a href="{url @context='unsafe'}" x-cq-linkchecker="skip"> test </a>