linkify

php 8.0, master / 4.13 / 4.12

having issues making it work properly
assuming this config, can also be only linkify

        $config->set('HTML.Allowed', 'b,strong,i,p,a[href|rel|target]');
        $config->set('HTML.Doctype', 'HTML 4.01 Transitional');
        $config->set('AutoFormat.Linkify', true);
        $config->set('URI.AllowedSchemes', [
            'https'
        ]);
        $config->set('HTML.Nofollow', true);
        $config->set('HTML.TargetNoopener', true);
        $config->set('HTML.TargetNoreferrer', true);
        $config->set('HTML.TargetBlank', true);
        $config->set('AutoFormat.AutoParagraph', true);
        $config->set('AutoFormat.RemoveEmpty', true);
        $config->set('AutoFormat.RemoveEmpty.RemoveNbsp', true);

results will be
http://google.com -> <p><a>http://google.com</a></p> unnecesary a tags

https://google.com -> <p><a href="https://google.com" rel="nofollow noreferrer noopener" target="_blank">https://google.com</a></p> good

sometexthttps://google.com -> <p><a>sometexthttps://google.com</a></p> mising href and doesnt separate text from link

receive same resutls in demo page http://htmlpurifier.org/demo.php?filter%5BAutoFormat.AutoParagraph%5D=1&filter%5BAutoFormat.DisplayLinkURI%5D=1&filter%5BAutoFormat.Linkify%5D=1&filter%5BAutoFormat.RemoveEmpty%5D=1&filter%5BAutoFormat.RemoveSpansWithoutAttributes%5D=1&filter%5BNull_CSS.AllowedProperties%5D=1&filter%5BCore.CollectErrors%5D=1&filter%5BHTML.Allowed%5D=b%2Cstrong%2Ci%2Cp%2Ca%5Bhref%7Crel%7Ctarget%5D&filter%5BHTML.Doctype%5D=HTML+4.01+Transitional&filter%5BHTML.SafeObject%5D=0&filter%5BHTML.TidyLevel%5D=medium&filter%5BURI.DisableExternalResources%5D=0&filter%5BNull_URI.Munge%5D=1&html=%3Cp%3Eaaahttp%3A%2F%2Fhtmlpurifier.org%2Fdemo.php%3C%2Fp%3E%0D%0A%3Cp%3Ehttp%3A%2F%2Fgoogle.com%3C%2Fp%3E&submit=Submit
interestingly checking "experimental" checkbox fixes everything

Reproduce the reported outputs with the PHP 8.0 configuration in the issue, then compare the normal and experimental demo behavior. Trace the AutoFormat.Linkify handling for plain and embedded URLs; done means valid URLs receive the expected href and surrounding text is separated without unnecessary empty anchors.