Running high jump is 3' + Str modifier, so that's 7' for an 18Str Michael Jordan. That's clear space below your body and you can reach up your height x 1.5, Prince of Persia style. Standing high jump? Halve the clearance below.
So MJ running high jumps 7' and at 7' tall, adds 10.5' for a grand total of 17.5' slam dunk. Already over the top, add giant strength potions, we're clearly in epic fantasy.
(This jump would require the PoP animation with characters hauling themselves up with hands and feet. I wonder how implementing rope will affect this?)
Except that 7' clearance is not the number being used for high jump. BG3 is using the running jump distance and things are clearly a bit gonzo. (But with falling ladder glitch, gonzo is needed!) No wonder CC spells feel weak, everyone's flying over them.
Grease makes no mention of flammability in TT, and Entangle/Plant growth bring forth abundant greenery, i.e. full of water! Shouldn't be easily flammable, I could see a sustained flame like Flaming sphere or Wall of fire, but not instantaneous flames like Fireball.