Escape url tags before attempting to add missing mention links in Protocol\ActivityPub\Processor

- Mastodon uses @-sign in profile URLs which wrongly triggered the mention link add in existing mentions links

src/Protocol/ActivityPub/Processor.php

@@ -1207,6 +1207,7 @@ class Processor
 		// This prevents links to be added again to Pleroma-style mention links
 		$body = self::normalizeMentionLinks($body);
 
+		$body = BBCode::performWithEscapedTags($body, ['url'], function ($body) use ($tags) {
 			foreach ($tags as $tag) {
 				if (empty($tag['name']) || empty($tag['type']) || empty($tag['href']) || !in_array($tag['type'], ['Mention', 'Hashtag'])) {
 					continue;
@@ -1222,6 +1223,9 @@ class Processor
 				$body = str_replace($tag['name'], $hash . '[url=' . $tag['href'] . ']' . $name . '[/url]', $body);
 			}
 
+			return $body;
+		});
+
 		return $body;
 	}
 }