(Mild bug, fixable.) Can't add items to a custom build in the sandbox.

[Cambino]

Attempting to edit a custom build and add an item to it occasionally does not work. You will receive an audio cue that you've added the item to the build, but it doesn't actually put it in. The fix is actually really easy, just restart your game.

This bug occurred after I loaded into the sandbox first thing, before going into any games.

 

[guygotgoo]

I can reproduce this by going into the builds tab in the Heroes menu before going into the sandbox