Cats prioritize pathfinding to a bed over other tasks, like following the player or breeding

The bug

Cats won't move either teleport when then they want to sleep or sit in a bed that requires to walk upstairs, open doors or climb up the ladder (or is blocked by blocks). To make them move/follow/teleport you need to move cats while they are sitting or just teleport them using command.

Code analysis

Code analysis by JingyBreadMan can be found in this comment.