https://github.com/Samsuik/Blossom/blob/master/patches/server/0048-Configurable-Golems.patch
it just adds settings, but it doesn't make it work, I think (the changes may have been implemented in another patch, but I don't think so)

Paper added 2 patches to fix issues related to entity teleportation:

https://github.com/PaperMC/Paper/blob/ver/1.8.8/Spigot-Server-Patches/0075-EAR-Fix-bug-with-teleporting-entities.patch
https://github.com/PaperMC/Paper/blob/ver/1.8.8/Spigot-Server-Patches/0077-Process-Entity-Chunk-Registration-on-Teleport.patch

The first patch has its description as Spigot PR (unfortunately my number is blocked, as I haven't used it for a long time, so I don't have access): https://hub.spigotmc.org/stash/projects/SPIGOT/repos/spigot/pull-requests/52/overview

However, I believe this is the solution: https://hub.spigotmc.org/stash/projects/SPIGOT/repos/spigot/commits/7127db5a842375b7e1b452e260ff6a6cb2537ddc#CraftBukkit-Patches%2F0014-Entity-Activation-Range.patch (implemented in Spigot 1.9)

The only difference is that instead of adding a workaround:
https://github.com/PaperMC/Paper/blob/ver/1.8.8/Spigot-Server-Patches/0075-EAR-Fix-bug-with-teleporting-entities.patch (this patch), the fix sent to Spigot seems to fix it appropriately: https://hub.spigotmc.org/stash/projects/SPIGOT/repos/spigot/commits/7127db5a842375b7e1b452e260ff6a6cb2537ddc#CraftBukkit-Patches%2F0014-Entity-Activation-Range.patch?t=208

This commit is upstream of Paper 1.9: PaperMC/Paper@cd3d8fb, in this commit the CB is also updated and there is a fix that I'm not sure if there is any relation between the problem: https://hub.spigotmc.org/stash/projects/SPIGOT/repos/craftbukkit/commits/f01861f80bc8d903f72210e7d79c90c35473aa74#nms-patches%2FPlayerList.patch

I would create a PR to resolve this if I had time to debug and know if I was correct, but unfortunately I don't

You could just backport: https://github.com/PaperMC/Paper/blob/master/patches/server/0995-Use-distance-map-to-optimise-entity-tracker.patch