In singleplayer survival the game suddenly crash/freeze with message in console reading "(playername) was kicked for floating too long!".
Steps to reproduce:1. Build a minecart elevator2. Use minecart elevator3. While holding right mouse button to ascend, the game will suddenly crash
1. Make a minecart rest on top of a ladder (as they do in minecart elevators)
2. Enter minecart and wait
3. After only a couple of seconds the game will kick the player for floating too long and stop responding/crash
Console output on crash:
[17:32:12] [Server thread/WARN]: <playername> was kicked for floating too long!
[17:32:12] [Server thread/INFO]: <playername> lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[17:32:12] [Server thread/INFO]: <playername> left the game
[17:32:12] [Server thread/INFO]: Stopping singleplayer server as player logged out
[17:32:13] [Server thread/INFO]: Stopping server
[17:32:13] [Server thread/INFO]: Saving players
[17:32:13] [Server thread/INFO]: Saving worlds
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That line is probably from MC-79925.
The bug is indeed caused by sitting in a minecart thats resting on a ladder for too long! Didn't take long either, the client crashed after only 2-3 seconds.
Seems to be fixed for 15w44b!
Seems I spoke too soon. Just happened in 15w44b too 😞
Confirmed for 15w45a. The client no longer crashes, but exits gracefully with message "Flying is not enabled on this server" (see attached screenshot).

Can't reproduce in 1.10.2 in singleplayer. 16 blocks from the floor, whole minecraft night passes, nothing happens.
Still happens in 15w43c. It seems I may have forgotten to include a line from the previous console log - or perhaps this is new in this snapshot (notice the line @ 20:31:29 below).
Console output on crash:
[20:31:29] [Client thread/WARN]: Null returned as 'hitResult', this shouldn't happen!
[20:31:41] [Server thread/WARN]: <playername> was kicked for floating too long!
[20:31:41] [Server thread/INFO]: <playername> lost connection: TextComponent{text='Disconnected', siblings=[], style=Style{hasParent=false, color=null, bold=null, italic=null, underlined=null, obfuscated=null, clickEvent=null, hoverEvent=null, insertion=null}}
[20:31:41] [Server thread/INFO]: <playername> left the game
[20:31:41] [Server thread/INFO]: Stopping singleplayer server as player logged out
My minecart elevator is 16 "floors" tall, and this just happened as I reached the top floor (before I was able to exit the last minecart). I'm going to test whether the bug is simply caused by sitting in a minecart thats resting on a ladder for too long. Perhaps it's not related to the quick dismount/mount activity while using minecart elevators.