Played it again just in case but it's the same issue. Once I interact with the small red crystal on "Floor 1F", it changes to the heat/anger (?) form. From there, there are two ways to go. One, which is in the same floor, jumping on the rocks over Lava (which has a huge gap in the middle so I can't jump further). And Two "Floor B1" which also leads to a dead end.
I should have just Magma drifted across the Lava the first time once I activated the Big Red Crystal. But I have a habit to scout other places first before proceeding to the main story line. As always.
Anyways, is there any way around this? I've already patched the game, but that doesn't seem to work.
Another minor bug I've encountered is that I patched the game earlier for some other problem, My Decidueye's spirit shackle changed to Steam eruption. Not a bad move, but..