at 15:15 at this game, the blue player shoots with the longbow
on my own minegrave.

after the second shoot with the longbow to the minegrave of me,
it drops thru the land into the water ^^

is this a bug/glitch ?

It's a known bug/glitch. They just haven't decided to fix it yet.

It's a known bug/glitch. They just haven't decided to fix it yet.
Really? I'm sure it was fixed about 5 times.

This behavior is intended as part of the game design. Arrows extend land, and graves will fall through if their collision mask is obscured. It will not be fixed.

Ah, I must have been thinking of the "graves absorb arrows" glitch :o

This behavior is intended as part of the game design. Arrows extend land, and graves will fall through if their collision mask is obscured. It will not be fixed.
Hmm.
A very wormy way would be, instead of just falling through, making the grave explode. :D