Same problem here and on Android since the last update.
I assumed this is a feature: the rope breaks when you stretch it too long.
I had the same issue on my Realm. The part I was in generated two months ago and so for anyone else reporting it would be cool to add the age of your world and whether or not you can still reproduce this issue.
this is by tallgras rose bush lilac and sunflower...
Oh that is annoying...
I have the same issue and the realm is used by a PS4 player and an Android player. The realm owner is xSadBatman and the realm name is "kweetetnie".
I wonder if the cross platform playing here is causing the issue. I didn't have any problems until my son connected with his PS4... That could be a coincidence but I notice that other comments also indicated multi platform playing.
It requires many times to login and I tested this from multiple networks.