As much as you’ve seen people have rabbits in pens sharing walls, there are a good number who have a barrier between the rabbits so biting between bars cannot happen. You should not bond the two yet, but not because of this aggressive behavior, but because your baby rabbit is not neutered yet (that’s my assumption, based on your description). A hormonal rabbit can bring up hormonal behaviors in a fixed rabbit, and a hormonal rabbit is difficult to bond with another rabbit because they will be driven by hormonal instincts to mate and defend territory. Having a new rabbit in her territory can definitely be causing her to act differently towards everyone. Due to these factors, the best scenario is bar access between the two (no contact) and wait until your new boy is neutered, recovers from the neuter, and then you can begin bonding via pre-bonding (swapping scented items, like litter boxes).

While there can be instances of positive interactions, a healthy bond should not lead to rabbit injuries (bites, attacking), so do not take her flops as a sign that it’s safe to move forward. Neutering him first would be the most safe, preliminary step. He may be ignoring her now since he isn’t hormonal yet, but if he does become hormonal, the two may not have very friendly interaction through the cage wall.

100% what Wick said. If your baby is just 8 weeks old you will have to wait until he is about 4 or 5 months – so another two to three months to go – to have him neutered.
Do not allow them to be able to touch through the bars. Lots of bunny’s have been in fights through cage bars / have received nasty bites on the nose and face through them as well.

I have a male and female that I got when she was 12 weeks and he was 8 weeks… And this is what I did….

So their cages were far enough a part that they couldn’t actually touch through the bars, but they could still see / hear / smell each other.
They would then have individual out side run around time. This was the same area for both of them – as my house wouldn’t allow me to give them each their own free-run area – but they would take turns using it. This really helped them get used to the other bunny’s scent in an area that they were – including a shared litter box that I had out in that area.

After they had both gotten settled and more calm around the other one, about a month in (there was still territory marking though, as they hadn’t been fixed yet) I started Pre-PRE-bonding where I was swapping their items / toys / litter boxes between their cages.

Then they were spayed and neutered and each given a month to heal and start to get their hormone surges from that under control.
Two weeks after the spay / neuter I started full Pre-Bonding, where I would do the above but then also swapped their whole cages every day.

After that month I started the formal bonding process – this set me up for HUGE success as they were so used to the others smell and had no hormones getting in the way. I had almost no fighting between them – just the odd chase that resulted from a hump.
*My problem with my guys is that they both want to be the dominant one – this is their personalities though and this could have gone so much worse then it has been if I hadn’t done the pre-bonding.