This is not actually a bug, that's how all "Out of combat" items have always worked; attacking puts you in combat. Sprouting Egg works the same way. The part about a chest might be a bug though.
Me and my friend have experienced two distinct multiplayer bugs, one which is a high priority system-crashing bug. The other is a medium-priority broken-feature bug.
1. Attempting to connect to a person who is not currently hosting can cause the game to crash catastrophically, and almost takes down Windows entirely. The window loses focus, so no keyboard or mouse inputs are accepted by the game, and alt-tabbing or bringing up the task manager, or anything else does not work; the game won't let another window acquire focus. The only response I can get out of Windows is by telling it to log-off from the ctrl-alt-del menu, which will successfully close the program. This bug is more severe with me than my friend; as my friend's game simply turns to black, but he can still use the esc key to exit.
2. The "Share Items" button is missing from the multiplayer screen, resulting in the game is always forcing sharing, without a way to turn it off. As I normally only play with friends and we talk and communicate, forced sharing is annoying
From your description I'm assuming you had the exact same bug as me. In my testing, I could only make the bug happen when I was connecting to someone who wasn't hosting yet, or had stopped hosting before I joined. Is the bug happening to you even when you're certain the other person is successfully hosting first?
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