$gold is not explicitly used in loadP() but in saveP().

Hence it's not in the closure of loadP and the dynamic eval can't find it.

That's how Perl decides to populate the so called variable (Scratch)Pad of a sub at compile time. ¹

Workarounds

• explicitly name all private vars you need inside the sub
• otherwise use localized package variables
• UPDATE have the private vars available in the scope of the caller(s) ²

Updates

¹) see also PadWalker

²) see Re^2: trouble with packages/eval/variable-scoping (caller's scope)

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