File::Find isn't threadsafe.
From the source code:
# Should ideally be my() not our() but local() currently
# refuses to operate on lexicals
our %SLnkSeen;
our ($wanted_callback, $avoid_nlink, $bydepth, $no_chdir, $follow,
$follow_skip, $full_check, $untaint, $untaint_skip, $untaint_pat,
$pre_process, $post_process, $dangling_symlinks);
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