if [ -R foo ] then .. fi
POSIX sh has no concept of namerefs. Rewrite your logic to not depend on them, or switch to Bash or Ksh.
[ -R name ] is used to check whether name is a nameref. Since POSIX sh has no namerefs, either use a shell that does, or rewrite to not need namerefs.
[ -R name ]
name
nameref
None
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