On a mac, in a Character blueprint, taking the Character Movement → Current Floor Hit Result Normal, the connection will disappear when saving and re-loading the project. The connection works fine, it just needs to be reconnected every time the project is opened.
This happens if the Current Floor Hit Result Normal is assigned to a variable or piped directly into e.g. Make Rot From ZY as in my example.
After save and reload, I get this:
