The Hive supports both 1.12 and 1.13. 1.13 introduced significant changes to the skin format, causing big compatibility issues between the two versions.

As such, we will drop 1.12 support in a very quick timeframe.

Until then:

All players on all versions will be assigned a random Halloween skin for the Halloween period. This will be resolved within a few days. Hive Costumes still work.