Non-Ops Can't Run Commands by Right-clicking Signs in Spawn Protected Chunks

Players can not right-click signs at spawn to run any commands, even commands like /trigger, which they would normally have access to.

I'm not convinced this is a bug, perhaps just an over-looked feature during development, but I was told when making a suggestion on the /r/MinecraftSuggestions subreddit to report this as a bug instead, so I'm putting it here to hopefully give this problem some attention.

Sorry if this has already been posted. I searched but couldn't find anything that seemed like the same thing.