typo3-9.x

When updating from TYPO3 8.7 to TYPO3 9.5 you might drop the realurl extension in favor for the new routing feature. But you might notice, that realurl appended a / to all urls by default (when you are not using html suffix) The TYPO3 routing feature does not do that by default and there is currently no option in the core to enable this. Why is this a problem? In TYPO3 8.7 you got an URL like www.domain.tld/subpage/. In TYPO3 9.5 the same page be called with the url www.domain.tld/subpage. So even if this is the same page, for search crawlers, this is another URL. TYPO3 does a 307 redirect

I have a website with two languages e.g de and en. De is my default language with no path prefix. En, the second language, has /en/ as prefix in the url. Now when I switch to the en language, the menu item links have /en/ in the url, which is fine. But when I click on a menu item, which is not explicit translated in the backend, then I get a 404 error. I cannot say this behavier is wrong, because there isn't a page with this slug path before I create one. But what should I do? Create a translation for each page, which is not helpful, if there are already hundreds of pages. Is there no fallback