Some info related to the issue:
https://www.minebench.de/forum/viewtopic.php?f=31&t=14817
https://www.spigotmc.org/threads/better-beds.35210/page-4#post-1539013

A rewrite of the algorithm that calculates it should be able to solve the issue. Fixing the current implementation isn't really possible due to my messy old code. :/