Annoying "Buy Now" Reappearing

I have the same issue with v8.1.1 build 5001bc(32 bit)

Behaviour I see is as follows:
Start X1 ->Buy Now present
Turn off preview ->Buy now disappears
Turn on preview ->Buy Now appears
Turn off preview - BN disappears
Exit X1
Start X1 - BN appears (preview off)
Turn on preview - BN disappears
Exit X1
Start X1 - BN appears (preview on)
etc

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