Music no longer stops when switching gamemode

In the latest snapshot, when creative mode music plays, switching your gamemode no longer stops the creative mode music playing, even when switching into survival mode (tested in a  new superflat world).

This can cause creative mode music to play in survival mode.

I found that there was a bug report saying that the music shouldn't stop, but I also found a comment saying that it was working as intended.

Here are the links:

MC-36501

https://bugs.mojang.com/browse/MC-42711?focusedCommentId=126420&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-126420