Bukkit

Since PlayerHeads v4.7.0, cross-compatible builds for server versions 1.8-1.12.2, 1.13+ have been the default version, however when using them on 1.8-1.12.2 servers, there are some differences in behavior you should take note of.

These notes also apply to older, now-unsupported "backport" versions, which were made specifically for 1.8-1.12.2.

Known backport issues / notes:

• All server versions: Mobs can drop heads when they exist as distinct mobs (have their own entity type) or are able to be distinguished with the bukkit API [when they are a variant in an older version and a distinct mob in a newer version.]
• 1.8.x servers: There may not be support for the vanilla enderdragon head (added in 1.9) - a custom head may be used instead if this is the case.
• 1.8-1.13.2 servers: Spawner mobs cannot be tracked across restarts due to the lack of Persistent metadata APIs until 1.14.
• 1.8-1.10.2 servers: Husks cannot be fully detected because of the lack of a zombie variant API in bukkit at the time.
• Important for 1.11-1.12.2 Servers: There is a Minecraft bug involving excessive tagged items in death/chat messages (namely, shulker boxes). It's strongly recommended that you update to a 1.13+ server to solve this.