User Manager search, no result when using more than 16 characters in search field?

When searching for a user, I provide an email, when I write the first 16 characters of the email, I get a result, when I write more I get no result…

GET /admin/rest/security/principals?query=
With a query with more than 16 chars gives no results.

This might be related to ngram indexing max size… We’ll look into this.