Weird, my BU node says there's a block 0000000000000000004626ff6e3b936941d341c5932ece4357eeccac44e6d56c that's invalid. I think it's an SV block at 556767.
BU 1.5.0.0 says 000000000000000000a8539b8c94820a6926177430e3aa57b4a80ca9f84dee16 is the best height at 556768 at this moment.