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Input/output for plugins must be sanitized/escaped, so JSM Show Post Metadata uses to sanitize the post metadata key before using it. That function does not allow uppercase characters, which makes me wonder if the “WooShop” plugin is sanitizing their metadata keys (which are generally passed forms, etc., which is why they need to be sanitized). Which plugin creates the “_WooShop” metadata? I would offer NOT to sanitize metadata keys in JSM Show Post Metadata, but I don’t think that’s a good idea…
js.