After doing a bit more research I stumbled upon this:

Looks like systemd imposes another, smaller limit on the number of
processes that a user can run:

cat /sys/fs/cgroup/pids/user.slice/user-1000.slice/pids.max

It would have been nice if the 'fork' man page mentioned that this could
be a cause for failure. :(

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  Call to fork/clone fails with EAGAIN (before encountering resource

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