Welcome, that is interesting as I have just also looked and 3.0.0.4.388_33144 for the ASUS TUF AX6000 is not available.
I know ASUS RT-AX59U had a recent firmware release RT-AX59U Version 3.0.0.4.388_33144 which they (ASUS) have withdrawn due to issues with Apple Devices, so I assume the same for the TUF AX6000.
if you use apple devices, might be worth going back to your previous firmware release 
In a completely sane world, madness is the only freedom (J.G.Ballard).
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