Going to mark this as not a bug as we're not able to repro this at all on our end without the other player holding SHIFT - if that key is held, then you cannot heal the player (or spray them with the vaccine), this is by design.
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Going to mark this as not a bug as we're not able to repro this at all on our end without the other player holding SHIFT - if that key is held, then you cannot heal the player (or spray them with the vaccine), this is by design.