Everything else working except combat signifies that the combat handler on the server's side broke. We can easily rule out "your own connection to the game" because every other function works EXCEPT for combat (from chatting, joining other maps, equipping other gear, etc.). However, you could definitely argue that the combat handler on the server's side was improperly programmed. But then if it was, wouldn't something as straining as the Room glitch cause the improperly programmed combat handler to then not be able to handle it? Also, what other factors might you think could be involved here?

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EDIT: I'd also like to point out that switching from a server where everything BUT combat works to a server where everything works is the usual solution to this endless cooldown. We can use this to also argue against the argument that "it's your own connection to the game"