It should have been separatd into "new hire" and "long time employee", regardless of technical experience.

You should expect new hires (of any seniority level) to jump in and try to fix things. It shows they're invested, willing to embrace opportunities.

You should expect new hires (of any seniority level) to ask lots of questions. They need to learn this new environment, quickly. That's the best way to do it.

You should expect new hires (of any seniority level) to try to be extra helpful. They still don't know exactly where they can help the most, mapping the ground is a good sign.

You should expect new hires (of any seniority level) to be enthusiastic. It shows they value being there, and are on board with trying new approaches. In other words, it shows they believe themselves to be useful in that new environment.

It has absolutely nothing to do with being a senior, but being in a new environment. Of course, to juniors, every environment is new and they should do that all the time. Seniors should do that when they change environments, or when the environment changes for them.