Comment too long after word filters
The raw comment was within the length cap, but after applying bad comment words masking the body exceeded 4000 characters.
Why this happens
Banned substrings are replaced with a fixed mask (e.g. *). Many hits can expand length past the limit even when the original text was ≤4000. Different from Comment is too long, which rejects oversized raw input before filtering.
Diagnose and fix
1. Visitor: shorten the comment or avoid repeating filtered phrases.
2. Admin: review bad_comment_words — overly broad lists cause mass replacements.
3. Limit is a code constant (4000), not a Users & limits field.
4. Retry after editing.