Water causes fly false positives

[MZPL]

It happens when you're trying to jump immediately after placing water. It makes it also impossible to "climb" with water. Also, it occurs when you take water below you while jumping in river. /hawk dev:

Server version: git-Spigot-21fe707-e1ebe52 (MC: 1.8.8)
Bukkit version: 1.8.8-R0.1-SNAPSHOT
NMS version: v1_8_R3
Hawk version: BETA 2006.1 (DEV)
Async checking: false
Java info: 1.8.0_232; ; OpenJDK 64-Bit Server VM
Client version: 1.8.x
Ping: 0ms
TPS: 19.880293074430924
Load: 0.03372144
Plugins loaded (2): ProtocolLib, Hawk

Video: https://youtu.be/MPf_mef648Y