Jump into the door frame so that Samus is falling when entering this room. Morph before reaching the lava, Bounce, and Unmorph shortly after sink slightly before floating down to the stairs.

Entrance condition:

{
  "comeInJumping": {
    "minTiles": 4,
    "speedBooster": false
  }
}

Requires:

{
  "or": [
    "h_lavaProof",
    "canSuitlessLavaDive"
  ]
}
"canCarefulJump"
"canBounceBall"
{
  "heatFrames": 230
}
{
  "lavaFrames": 190
}