@RBW@seocommunity.social The title-links are now generated on a per-URL basis and only differ by desktop/mobile (due to space), so probably what you're seeing is either slight differences in the status of various datacenters (rare, imo), or slightly different URLs appearing in search (more common).
https://developers.google.com/search/docs/appearance/title-link has a lot more on titles, fwiw.