AutoTotem and fatal falls

AutoTotem can keep a totem in your offhand only when your health is low, using its Health limit. The new Fatal Fall setting (on by default) closes the gap where a fall kills you from full health.

What it checks

• Falls: it works out the damage you will take on landing from how far you have fallen and how far the ground below is. If that is at least your health plus absorption, it swaps even at full health.
• Elytra dives: diving steeply into the ground counts the same way.
• Elytra crashes: flying fast into a wall counts when the crash damage would kill you.
• Water below and creative flight do not count.

With Swap Back on, the old item is not swapped back until you have landed.

Armor and potion effects are not part of the calculation, so it can swap when you would have survived. That is on purpose.