Items doesn't glowing with team color

Item doesn't glowing with team color.

/scoreboard teams add dark_blue
/scoreboard teams option dark_blue color dark_blue
/summon Item ~ ~-3 ~ {Glowing:1}
/scoreboard teams join dark_blue @e[type=Item]

Then you can see black glowing Items, not a dark_blue.
Also not works in other colors.

Pig is just for compare.