YouGov Scotland poll is dire for Labour, now fourth behind the Nats Tories and LibDem. oh how the mighty have fallen
My understanding is that it was a subsample ergo it has less significance than a Yougov poll for Scotland
It's also worth noting that the Labour gains in Scotland were completely unheralded in 2017 - eg some of the media seriously tried to portray Glasgow East as a Tory vs. SNP duel. It's not yet clear whether this was simply a more extreme example of having missed the Labour surge, or whether there's a specific issue with Scottish polling.
Scottish polling at the time showed Labour rising to 25% or even above, it's just the narrative was set by the polls right after the election call that showed Labour in the teens so nobody really picked up on it at the time, and all the polling very much overestimated the SNP.