CAT_VALIDATION_ERROR_PATTERN_INVALID indicates the pattern attribute violates Snap's formatting rules. Use simple descriptors like 'striped', 'polka dot', or 'solid'.
Snap Catalog Manager's product schema has format and value rules per attribute. This issue is typically: missing a required attribute for the category, an invalid enum value (e.g., 'XL' submitted where 'M, L, XL' is the valid set), out-of-range numbers, or attributes that conflict across the feed.