I’ve set up a tavern at /warp food with two signs currently – wheat beer & russian vodka. It’s properly linked like all of my other signs. After one beer is purchased, signshop shows out of stock, even though there is a chest full of beer.

Here’s the process:

1. Put beer in chest
2. Hit chest with redstone
3. Place sign for beer
4. Hit sign with redstone, chest is linked
5. Fill chest with more beer
6. Buy 1 beer
7. Sign shows out of stock

The exact item that is linked in the chest is the one that is purchased.

Check the logs between 18:00 & 18:03 EST. I replicated this process during that time.