Minecraft 1.8.1, Minecraft 1.8.3, Minecraft 1.8.4, Minecraft 1.8.5, Minecraft 1.8.6, Minecraft 1.9.1, Minecraft 1.9.2, Minecraft 1.9.4, Minecraft 1.10
Maps will be kept in memory even after disconnecting from a server.
Proof: https://youtu.be/2vcMEGn4IgI ( 1Min 32 Sec )
The Video shows multiple reconnects to a Server resulting in a OutOfMemoryError with Vanilla 1.8.6
The only possible workaround is to restart the Minecraft-Client.
This is related to
MC-46345 ( MC-80297 ) and might be caused by the same faulty code - but the bug in itself is different.
This issue is not fixed in 1.9.2.
MC-46345 only refers to the maps no longer updating.
This report refers to the memory never being cleared and ultimately causing a OutOfMemoryError.
MC-88349 Client Memory leak: Map data does not get garbage-collected