The bug
When hitboxes are turned on, the blue line of sight of the Ghast points inward into the body rather than outside.
Reproduction steps
Turn on hitboxes using F3 + B
Go into spectator mode using
/gamemode spectator
Summon a Ghast using the command
/summon ghast ~ ~ ~ {NoAI:1
}
The blue line in the hitbox which represents the line of sight should point outwards, but instead points inward into the body of the Ghast.
See attached images below.
Can confirm.