Remove material 0 setting from gravestones in the Burial Ground map in Lake Country, the Gridarta map editor warned about this setting and material type 0 should not apply objects like this according to the docs

lake_country/small_buildings/burial_ground

@@ -8,7 +8,7 @@ enter_x 3
 enter_y 3
 msg
 Created:  1995-03-20
-Modified: 2021-07-25 Andreas Kirschbaum
+Modified: 2023-03-29 Rick Tanner
 endmsg
 end
 arch dungeon_floor
@@ -110,7 +110,6 @@ I wish to see Morrigan once more.
 endmsg
 x 1
 y 1
-material 0
 no_pick 1
 end
 arch magic_ear
@@ -231,7 +230,6 @@ Sannantes Rests Here.
 endmsg
 x 1
 y 3
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -306,7 +304,6 @@ Fourth Princess of Khundsdorf
 endmsg
 x 1
 y 4
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -463,7 +460,6 @@ I wish to rest in peace.
 endmsg
 x 1
 y 6
-material 0
 no_pick 1
 end
 arch dungeon_floor
@@ -597,7 +593,6 @@ I will revenge!
 endmsg
 x 2
 y 2
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -671,7 +666,6 @@ Volgenriss Sleeps forever Here.
 endmsg
 x 2
 y 3
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -745,7 +739,6 @@ H.j..uik .es. H.r.
 endmsg
 x 2
 y 4
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -910,7 +903,6 @@ Arch Stenton Lies Here, and died as he lived, without any gold in his pockets.
 endmsg
 x 2
 y 6
-material 0
 no_pick 1
 end
 arch dungeon_floor
@@ -1003,7 +995,6 @@ Whoever he may be, may He Find Fido(tm).
 endmsg
 x 3
 y 1
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -1053,7 +1044,6 @@ In Memoriam, His Wife and 44 Children.
 endmsg
 x 3
 y 2
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -1103,7 +1093,6 @@ I told them I was sick!
 endmsg
 x 3
 y 3
-material 0
 no_pick 1
 end
 arch corpse1
@@ -1193,7 +1182,6 @@ May She Eternally Hunt Dragons, In the Celestial Caves of Oron.
 endmsg
 x 3
 y 4
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -1264,7 +1252,6 @@ arch gravestone
 name Gurashdah the Old's Gravestone
 x 3
 y 5
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -1335,7 +1322,6 @@ arch gravestone
 name Gurashdah the Young's Gravestone
 x 3
 y 6
-material 0
 no_pick 1
 end
 arch dungeon_floor
@@ -1423,7 +1409,6 @@ Hrivernness Rests Here, after a short life of 947 years.
 endmsg
 x 4
 y 1
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -1473,7 +1458,6 @@ Remember Us, the Driffens!
 endmsg
 x 4
 y 2
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -1523,7 +1507,6 @@ Last House of Family Farkhenn.  Please clean your feet before stepping inside.
 endmsg
 x 4
 y 3
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -1597,7 +1580,6 @@ Jurudas Sleeps Forever Here.
 endmsg
 x 4
 y 4
-material 0
 no_pick 1
 end
 arch corpse
@@ -1681,7 +1663,6 @@ Morind Termaness
 endmsg
 x 4
 y 5
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -1757,7 +1738,6 @@ arch gravestone
 name <erased name>
 x 4
 y 6
-material 0
 no_pick 1
 end
 arch dungeon_floor
@@ -1850,7 +1830,6 @@ Simosianius Alidritus Rests Here.
 endmsg
 x 5
 y 1
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -1900,7 +1879,6 @@ Death cannot trap me!
 endmsg
 x 5
 y 2
-material 0
 no_pick 1
 end
 arch lich
@@ -1957,7 +1935,6 @@ arch gravestone
 name Hajij's Gravestone
 x 5
 y 3
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -2031,7 +2008,6 @@ Jurudan the Blond rests here.
 endmsg
 x 5
 y 4
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -2105,7 +2081,6 @@ Peace! In life or in death!!
 endmsg
 x 5
 y 5
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -2273,7 +2248,6 @@ I wish someone bring Dragonbane back and rid the land of dragons.
 endmsg
 x 6
 y 1
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -2352,7 +2326,6 @@ Rumors of my death are greatly exaggerated.
 endmsg
 x 6
 y 2
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -2426,7 +2399,6 @@ High Priestess of Fido, Marshall of the Crusaders.
 endmsg
 x 6
 y 3
-material 0
 no_pick 1
 end
 arch magic_mouth
@@ -2502,7 +2474,6 @@ arch gravestone
 name Aldurian Noren Rests Here
 x 6
 y 4
-material 0
 no_pick 1
 end
 arch magic_mouth