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  DB<82> $hash{$_} = $value  for @keys;

...
  DB<86> p $hash{'Prefix1=A:c:2'}{b}    # reading works!
2
  DB<87>

  DB<87> p $hash{'Prefix1=A:c:2'}{X}=42 # new entry
42
...
   'Prefix1=A:c:2' => HASH(0x35a48e8)
      -> REUSED_ADDRESS
  DB<89>