SN6507: SYNC mode causing latchup

The datasheets for SN6507 and SN6507-Q1 have differences in section 8.4.4 about SYNC mode.  The SN6507-Q1 describes a scenario wherein the device can lock up and quit switching and require power to be cycled to unlock it because it can't automatically switch between SYNC mode (with an externally-applied clock) and the resistor-controlled clock mode.  The SN6507 says that it DOES automatically switch between those modes and, presumably, will therefore not lock up.  It seemed odd that this difference would exist between these 2 closely-related (and with identically part markings, by the way) devices, but I was inclined to believe it until I saw this complaint on the forum about the SN6507 locking up (the one that is supposed to NOT lock up).  Is it true that only the SN6507-Q1 will lock up and the SN6507 will not (and that somehow the previous complaint was from someone who mistakenly was using an SN6507-Q1 and didn't realize it)?  Or do both parts lock up and the SN6507 datasheet just hasn't been updated yet to reflect that?