You can also create an account and just leave a note on the map (a message that other contributors to OSM see) mentioning your observations. It’s a good option if editing the map is too overwhelming with all the different tags and how routing algorihms interpret them.

I know people don’t like sending patches to mailing lists and prefer the zoomer PR UI but god damn if you look only at the protocol openness perspective nothing comes close. sr.ht is great in that regard