As explained in
MDL-66382 'Display H5P' filter is ignoring H5P URLs inside tags like <a href="xxx">
But when somebody copy an H5P content URL from a Chrome browser address bar and paste it in Moodle rich text editor, is pasted as a link, inside <a> tags. So 'Display H5P' filter is not applied in those cases.
'Convert URLs into links and images' filter is ignoring content inside tags as well, but 'Multimedia plugins' filter is not ignoring them. So maybe the best behavior for filters should be decided and implement it consistently all along Moodle filters.