Im not quite seeing what could be causing the issue. Just to be sure, had you triggered and completed the cutscene in the final room by walking to the edge? Its required to leave the zone.
Yes. Once the fight ended, I got the cutscene with the rival with the awakened blade near the statue, got the powerup, walked to the checkpoint to save, entered the room with the warp point, tried to enter it to no avail, got back to the previous room with the rival gone and then tried wall jumping all over the two rooms to try to escape them.
As I said, I was able to use the two warp points before it, but then I couldn't use them to get back to where I was, so maybe the hardlock bug is linked to that.
I moved around the rooms as much as possibles, nothing triggered. I guess you mean a cutscene is supposed to take place behind the wall that the room with the crystal/warp point has, but nothing happens when I move around the room.
Maybe I broke something by trying to enter the crystal before the cutscene started?
just rushed through stages 2-3-5 but didn't encounter any of the bugs you mentioned so it sadly seems to be specific to you or something you have done outside of what was mentionned.
but since you are able to modify the savefile, you have the option to bypass the crystal door requirement by altering the WEQuest variable to 6, through i would understand if you do not wish to pursue your playthrough after this incident.
PS: if you could provide a screenshot of the room containing both the door and the space past the right wall, i may have better luck at identifying the issue.