Pretty self-explanatory - enemies using the built-in Ghost movement functions will move over pitfalls even if the Move Flag "Can Walk Over Pitfalls" is unchecked.
EDIT: This is able to be worked around by setting the combo flag to 97 (No Ground Enemies) - but this may prevent knockback into pitfalls as well if this is desired.
Edited by Mitchfork, 22 January 2021 - 01:22 AM.