Use a mid-air wiggle to reduce the height of Samus' hitbox after the walljump, to be able to fit through the gap without morphing.

Entrance condition:

{
  "comeInShinecharging": {
    "length": 2,
    "openEnd": 0
  }
}

Requires:

"canWalljump"
"canMidairWiggle"
"canShinechargeMovementTricky"
"f_KilledMetroidRoom2"

Exit condition:

{
  "leaveShinecharged": {
    "framesRemaining": 50
  }
}