Looking closer. That feature was only meant for adding entries to the "Index Editor" and *not* for use with "Mark for Index". They removed it since regular expressions patterns are now supported in the Index Editor which means it can be used to match a number of variations of a word or phrase making the ";" approach obsolete.
So not a bug, but the Sigil Users Guide does need to be updated.
The issue with your example epub is that the string "My Title" is no where in the document itself so it can not be found by a pattern.
So my trick of using display hidden, is probably the only way to force creation of a "My Title" entry in the Index using the "Mark for Index" approach.
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