Wildcarded requests don't return expected results

[dmitriim]

Moodle version 4.1
Search version: 6.6.1

When searching for a string containing some special symbols (like '-' ) e.g. Self-Confidence, it doesn't return any results if wildcard setting is enabled. E.g. Wildcard at the end.

With Wildcard at the end on:

With Wildcard at the end off: