Despawning and Respawning Glitch

The way Chip's Challenge 2 loads levels can cause objects to spontaneously appear or disappear as soon as a level starts, usually by activating another glitch in the previous level or before resetting the level. Such instances of objects disappearing or appearing are documented here.

It can be seen in this example gif, wherein Chip spring mines a block off a turtle and resets the level after dying from doing so. The eye is only included for visibility.

See also this gif, which demonstrates that the object doing the pushing does not need to be the player as long as you restart at the right time:

This also works when the entity that is spring mined off the turtle does not match the entity at the start of the level: