• Immigration is a non issue for Labour/LD/Green. It won't pull people back to Labour.
• The anti-Semitism accusations have stuck to the greens, but not really amongst labour voters. It's stuck more with right wing parties who weren't voting green anyway.

Honestly I think these two things are the biggest takeaways that Labour need to get a grip on.

They need to shut up about "small boats", they are not going to win reform voters over (a fact that should be obvious to a concussed duckling), and their own voters aren't interested. They also need to stop fawning all over Israel, it's a bad look and comes from a position of overcompensation, and it turns out they don't need to compensate at all, because again, their potential voters don't care.
I really thought that a former lawyer would be smart enough to not play the opposition's games.