Fire seems to be able to block explosion damage. When causing an end cristal to explode while it's sitting on fire, like it's the case in the naturally generated end crystals in the end, the player takes way less damage than expected.

Original description

Even without armor and the bottom of my hitbox directly exposed to the end crystal explosions, I was only taking 1 heart of damage at most. Only happens in The End dimension, and did not happen in 1.15.