Age tag doesn't work on End Gateways

When I use /setblock and /fill with the end gateway and add the {Age:201} tag it does not remove the magenta beam on the end gateway. The tag is supposed to removed the beam when higher than 200.

Ex:

/setblock ~ ~ ~ minecraft:end_gateway 0 replace {Age:300}

Note: I am using Minecraft 1.12.1 on Minecraft Realms.