Suggestion: Ember Bay Jumping Puzzle
^This.
Also I’m actually surprised they didn’t incorporate the unique mechanic of Ember Bay a.k.a. Thermal Tubes into the JP. Thermal Tubes could either be a puzzle mechanic (think skritt tunnels in the last bit of the SW JP) or act as checkpoint teleports (like the tunnels you pay for to get you back in if you mess up in the SW JP).
The latter could probably be added without adversely affecting the puzzle as is and might fix some of the bugs the checkpoints have.
Also, please add an easier way to know if you have the checkpoints. Right now I pretty much just suicide and hope for the best.