From what I can tell, a writeback is unpredictable with LR for both loads and stores. This changes the operand from a gprnopc to a rGPR in both cases (which I believe is essentially a NOP due to the tied-def already being a rGPR.)
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Oh yes, I must have seen if Rn == '1101' && W == '1' and absentmindedly interpreted the W as a write to memory, not a write back to the register.