Leaving boat = boat destructed

It looks like stepping out of a boat has changed in 1.7.4 (1.7.3?).
In 1.7.4 the player is put in the air above the boat when pressing LSHIFT to dismount the boat. Thus the player falls down on the boat that gets destructed!
This is not so in 1.7.2: when pressing LSHIFT the player is placed next to the boat and the boat stays where it is.

Tested with the same world and setup (boat in water, adjacent to sand) in both versions.

Details

Minecraft Version: 1.7.4
	Operating System: Windows 7 (amd64) version 6.1
	Java Version: 1.7.0_45, Oracle Corporation
	Java VM Version: Java HotSpot(TM) 64-Bit Server VM (mixed mode), Oracle Corporation
	Memory: 306385816 bytes (292 MB) / 551550976 bytes (526 MB) up to 954728448 bytes (910 MB)
	JVM Flags: 2 total; -XX:HeapDumpPath=MojangTricksIntelDriversForPerformance_javaw.exe_minecraft.exe.heapdump -Xmx1G
	AABB Pool Size: 25221 (1412376 bytes; 1 MB) allocated, 3 (168 bytes; 0 MB) used
	IntCache: cache: 0, tcache: 26, allocated: 12, tallocated: 94
	Launched Version: 1.7.4
	LWJGL: 2.9.1
	OpenGL: AMD Radeon HD 6470M GL version 4.2.11591 Compatibility Profile Context, ATI Technologies Inc.
	GL Caps: Using GL 1.3 multitexturing.
Using framebuffer objects because OpenGL 3.0 is supported and separate blending is supported.
Anisotropic filtering is supported and maximum anisotropy is 16.
Shaders are available because OpenGL 2.1 is supported.

	Is Modded: Probably not. Jar signature remains and client brand is untouched.
	Type: Client (map_client.txt)
	Resource Packs: []
	Current Language: English (US)
	Profiler Position: N/A (disabled)
	Vec3 Pool Size: 2707 (151592 bytes; 0 MB) allocated, 24 (1344 bytes; 0 MB) used
	Anisotropic Filtering: Off (1)