you are automatically dismounted of flying mount on contact of water on the center of shattrah

Description

you are automatically dismounted of flying mount on contact of water on the "lakes" on the center of shattrath with celestial steed or headless horseman's mount.

place near bug
[17:29:45] You are outdoors.
[17:29:45] Map: 530 (Outland) Zone: 3703 (Shattrath City) Area: 3703 (Shattrath City) Phase: 1
[17:29:45] X: -1831.699463 Y: 5397.496582 Z: -12.427644 Orientation: 5.629685
[17:29:45] grid[28,42]cell[4,0] InstanceID: 0
[17:29:45] ZoneX: 56.479404 ZoneY: 41.080761
[17:29:45] GroundZ: -100000.000000 FloorZ: -12.428149 MinHeight: -150.000000 Have height data (Map: 1 VMap: 1 MMap: 1)

place with bug

[17:30:10] You are outdoors.
[17:30:10] Map: 530 (Outland) Zone: 3703 (Shattrath City) Area: 3703 (Shattrath City) Phase: 1
[17:30:10] X: -1826.723511 Y: 5388.885254 Z: -13.250280 Orientation: 0.596846
[17:30:10] grid[28,42]cell[4,0] InstanceID: 0
[17:30:10] ZoneX: 57.138645 ZoneY: 40.509361
[17:30:10] GroundZ: -100000.000000 FloorZ: -13.250408 MinHeight: -150.000000 Have height data (Map: 1 VMap: 1 MMap: 1)
[17:30:10] Liquid level: -12.621433, ground: -13.250404, type: 13, flags 1, status: 4.

on other places they don't dismount on contact with water

Expected behaviour

you aren't dismounted (tested on both TBC classic and SL)

Steps to reproduce the problem

.tele shattrath
go to the center
summon a flying mount
enter to "lakes"
be dismounted

Branch

3.3.5

TC rev. hash/commit

3c84972a36cf

Operating system

debian 10 x64

Custom changes

n/r

Start by reproducing the issue with .tele shattrath, a flying mount, and the reported lake coordinates on branch 3.3.5. Compare the Shattrath water behavior with other water locations, then trace the movement, liquid, and mount-dismount handling involved. Done means flying mounts remain mounted on contact with these lakes while ordinary water behavior is unchanged.