Reproduced the "light armour" bug again, thsi time with extended debug messages (especially the "LE" number) ... it is sent correctly to InvAdd (client), but the data does not seem to exist there.
Debug messages used: http://mattn.ninex.info/patches/G_InventoryToFloor_debug5.patch

MSG_WriteFormat: bbs
MSG_WriteFormat: bbbbbb
G_ClientInvMove ================ 111
G_ClientInvMove ent inventory:
Container: 0
Container: 1
Container: 2
Container: 3
.. item.t: 56, item.m: 255, item.a: 0, x: 0, y: 1
.... weapon: pbeampistol_ammo
.. item.t: 40, item.m: 255, item.a: 0, x: 3, y: 0
.... weapon: grenl_ammo
.. item.t: 40, item.m: 255, item.a: 0, x: 2, y: 0
.... weapon: grenl_ammo
.. item.t: 43, item.m: 255, item.a: 0, x: 1, y: 0
.... weapon: grenl_plasma_ammo
Container: 4
Container: 5
.. item.t: 55, item.m: 56, item.a: 16, x: 0, y: 0
.... weapon: pbeampistol
.... ammo:   pbeampistol_ammo (16)
Container: 6
Container: 7
.. item.t: 39, item.m: 43, item.a: 9, x: 6, y: 1
.... weapon: grenl
.... ammo:   grenl_plasma_ammo (9)
Container: 8
Container: 9
G_ClientInvMove floor inventory:
G_PrintFloorToConsole: Printing containers from floor at 152,117,0.
Container: 0
Container: 1
Container: 2
Container: 3
Container: 4
Container: 5
Container: 6
Container: 7
.. item.t: 39, item.m: 43, item.a: 9, x: 6, y: 1
.... weapon: grenl
.... ammo:   grenl_plasma_ammo (9)
Container: 8
Container: 9
G_ClientInvMove ================ 111
G_ClientInvMove: (to==existing floor) LE is 86|0X56
MSG_WriteFormat: bbbbbb
G_ClientInvMove ================ 222
G_ClientInvMove ent inventory:
Container: 0
Container: 1
Container: 2
Container: 3
.. item.t: 56, item.m: 255, item.a: 0, x: 0, y: 1
.... weapon: pbeampistol_ammo
.. item.t: 40, item.m: 255, item.a: 0, x: 3, y: 0
.... weapon: grenl_ammo
.. item.t: 40, item.m: 255, item.a: 0, x: 2, y: 0
.... weapon: grenl_ammo
.. item.t: 43, item.m: 255, item.a: 0, x: 1, y: 0
.... weapon: grenl_plasma_ammo
Container: 4
Container: 5
.. item.t: 55, item.m: 56, item.a: 16, x: 0, y: 0
.... weapon: pbeampistol
.... ammo:   pbeampistol_ammo (16)
Container: 6
Container: 7
.. item.t: 39, item.m: 43, item.a: 9, x: 9, y: 1
.... weapon: grenl
.... ammo:   grenl_plasma_ammo (9)
Container: 8
Container: 9
G_ClientInvMove floor inventory:
G_PrintFloorToConsole: Printing containers from floor at 152,117,0.
Container: 0
Container: 1
Container: 2
Container: 3
Container: 4
Container: 5
Container: 6
Container: 7
.. item.t: 39, item.m: 43, item.a: 9, x: 9, y: 1
.... weapon: grenl
.... ammo:   grenl_plasma_ammo (9)
Container: 8
Container: 9
G_ClientInvMove ================ 222
InvAdd: LE is 86|0X56
InvAdd: message ignored... LE 86 not found
InvAdd: ignoring:
Item: 39 grenl
... name          -> Granatwerfer
... type          -> biggun
... category      -> 49
... weapon        -> 1
... holdtwohanded -> 0
... firetwohanded -> 1
... twohanded     -> 0
... thrown        -> 0
... usable for weapon (if type is ammo):