This problem is not in the printing of the instruction ?
"In 64-bit mode, the instruction’s default operation size is 32 bits. Using a REX prefix in the form of REX.R permits access to additional registers (R8-R15). Using a REX prefix in the form of REX.W promotes operation to 64 bit operands. See the summary chart at the beginning of this section for encoding data and limits."
I think the documentation of this instruction with memory operand is anyway hard to understand.

No, the problem is not in printing. The problem is in the semantics.

If you run (pseudo-code):

x := 137
cf := BT(p, x)

this will set cf to the value of the bit at position 137 after p. This instruction can read a bit very far away from the given address.