Wait for the acid to go down before entering the Morph tunnel, and again once reaching the other side.

Requires:

{
  "obstaclesNotCleared": [
    "B"
  ]
}
"Morph"
"canSuitlessLavaDive"
"canCarefulJump"
{
  "heatFrames": 700
}
{
  "acidFrames": 15
}
{
  "or": [
    "canDash",
    {
      "heatFrames": 50
    }
  ]
}