Trying to boot up a world with an incompatible `resources.zip` causes the game to show the resources loading screen twice and kicking the player on the title screen.
Upon opening the world selection, the world appears unavailable.
(try this a few times if it doesn't work the first time.)

Without closing MC, trying to delete or rename the resources.zip says it is in use by the Java run time.

A sample resources.zip has been attached. simply add this to a world and try to load it.

Additionally:

The resources.zip remains "Selected" even though it failed to load. And even after loading another world.