Finally, I've fixed my issue, so here's some screenshots of various things:
The item chest test. Chests display and are picked up properly. The entire thing is faster than the CSE version thanks to det(1,__).
The boss fight test. Bosses display and are handled properly, including pre-fight quip, battle trigger, and dropping the proper teleport stone. Also shown is the teleport stone functionality, which also functions as it did in the CSE version. If I had implemented World 2 maps, I could've teleported there instead of back to the World 1 town, but like I said, everything is implemented.