The plasma health upgrade from the incredibly hard jump over the train tracks in Cerulean Cove is lost when changing locations (going through a door or on the train). The actual plasma item is also lost on death, which is an issue because of how little health you have left after completing the jump. There is also an infinite death loop where, if you stand too close to the tracks on your way back it will save your respawn location on the tracks.

Clarification: This bug only applies to the plasma on the left, where there's a sign that says nice job. The other side works fine.

Also, if you put a different plasma into the forge, it will give you it's bonus plus the bonus that you lost, but the extra will go away again when changing locations

Edit: It fixes itself when performing the infinite health glitch

Edit: Nevermind, thats a completely different bug. Disregard my last comment