RAK7201: Long delay needed between button presses with confirm disabled

Since I’m using TTN (free) the number of downlinks are highly limited (10 per day). So I disabled confirms via at+set_config=lora:confirm:0.

However, now I have to wait ~5-7s between pressing two buttons, or the second button press is simply ignored. Is there a setting to lower this timeout? Sending the message takes less than a second (as confirmed via the TTN live data view), so it seems to be some arbitrary wait period, as if it’s waiting for a confirm that will never be received…