Work around is to drop a nail just beside the saved latitude longtitude location and save as favourite under a new name. Then you will be able to get the right route in Apple maps on the iPhone. Works for me.

Hi Freddy.  Workaround can be found in "community.plus.net/t5/Everything-else/IPhone-iPad-Mac-The-network-is-blocking-encrypted-DNS-traffic/m-p/1846737" (Hope I am not doomed now by sharing this link)  I chose solution number 1 by adding "mask.icloud.com" and "mask-h2.icloud.com" in the white list on my Deco X60 router. I also chose 1.1.1.1 as my main DNS and 1.0.0.1 as alternative pointing to Cloudflare. After a check at https://1111/help my iPhone 11 iOs 15.2.1 showed ”Using DNS over HTTPS (DoH) YES” and I have not seen the ”DNS encryption blocked” anymore on my Wifi 2.4Ghz / 5Ghz. Apples reference can be found at https://developer.apple.com/support/prepare-your-network-for-icloud-private-relay/ so it is a known issue and workaround so must be legit. Hope this will help you and your clients. It did for me thanks to Neil Townsend :-) Good Luck!