@short sierra I actually had this issue with the bullet shells. The fix was to enable "Use CCD". Hopefully this works for you.
#Falling Weapons will Pass Through The Ground
short sierra
@celest cliff thanks for your reply, however, use CCD didn't solve this issue 😢
short sierra
That is, in the collision settings for the mesh.
Seems it's solved by check use ccd in physics asset rather than blueprint class, thank you so much 👍