Bucket-filling bug

[DCSaunders]

There is a bug where sometimes buckets will be empty but you won't be able to fill them from the inventory.

As far as I can tell it happens if you fill a bucket too quickly after it's emptied (maybe between bird finishing it and bird actually leaving it?). It seems to happen with any kind of food. Buying a large amount of e.g. seedbuckets and just clicking on them repeatedly in the inventory as fast as possible as birds eat seems to trigger it.