Avoid use after free in internal prop type verification

This issue only applies to debug builds: read_property can free
the object, but we'd try to check the object handlers afterwards.

Avoid use after free in internal prop type verification

This issue only applies to debug builds: read_property can free
the object, but we'd try to check the object handlers afterwards.
Rewrite the check in a way that only accessed the object before
the read_property call.

Fixes oss-fuzz #38297.

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