Overview:
Minecraft doesn't free unrequired memory after exiting a world.

What I expect to happen:
After exiting a world, minecraft should free up memory pertaining to the exited world

What actually happens & Steps to reproduce
Minecraft doesn't free all unrequired memory from prior exited world:

1: Enter/create a world
2: Mark down memory usage
3: Explore, build, etc in said world
4: Mark down memory usage
5: Exit world (but not minecraft)
6: Repeat process a few times

With each world cycling, minecraft's used memory grows. Increasing allot-able memory only delays the "Out of Memory" error, but after cycling enough times, it begins to happen again

Did search using: "Out of Memory". All bug reports found were pertaining to the "out of memory" error itself rather than reporting minecraft not cleaning up properly