|The stupid question is the question not asked|
The first thing that leapt out at me was:
That looks very wrong to me. One the main reasons for using perlbrew is that you avoid messing with the system perl.
I used to use perlbrew on macOS but haven't since about 2018/2019. I no longer have the Mac machine, so can't help with any direct testing. I do not recall output like that, but that's just a 4-5 year old memory.
I'm currently running perlbrew on Cygwin. I get:
What does `perlbrew info` output when run from the new (apparently, problem-free) account?
Did you accidentally `perlbrew switch` to the system perl on the old (problematic) account? If so, try switching to the last working perlbrew perl version and see if that helps.
In reply to Re: How can I track down why perl 5.34.0 will install on one user account on macos with perlbrew and not another?