I think that's a bad sellers title/description.
I think this is what you have:
Beelink MiniMXIII II Amlogic S905x RAM 2GB EMMC 16GB Up to 32GB - Android TV BOX - Beelink - Powered by Discuz!
(not a store link)
I dont see a MiniMXIII S905x from them on their site.This is most likely part of your problem
I will try to check what chip is inside. But if it's the S905 and not the X, shouldn't the standard S905 build work? Now, I have the build especially for the S905X (Pulsar build) that is working...
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I can confirm my unit has the S905X. I checked with CPU-Z and it says it's the Amlogic p212 board.