i believe maybe jumping over there the collider that recognizes the floor has triggered with the invisible one, something to check.
indeed, the lighting was done through URP, there are some steps you must follow to implement the feature, such as creating and adding an asset to the scene at the graphic settings, and them creating a new one for the 2d, which was the case for this game, and adding it to the light renderer. also you need to upgrade the project to consider this new lighting. at the scene, besides the lantern, there is a global light, weaker, to give the overall ambience.
I didn't explain very well how to implement the lighting, but I believe at brackeys channe in youtube there is a good tutorial on this! thanks for playing and for the feedbacks!