sorting results by title does not honour {{DISPLAYTITLE}}

[jrbray1]

DynamicPageList3 version: 3.4.6 MediaWiki version: 1.35.8 PHP version: 7.4.3

{{#dpl:
| debug=1
| linksto={{PAGENAME}}
| ordermethod=title
| redirects=exclude
| suppresserrors=true
| namespace=
}}

shows results sorted by page name, not the {{DISPLAYTITLE:title}}. Extension DisplayTitle is being used