Somewhat changed how system chat messages that were sent as game chat messages and were edited using the 'GAME_CHAT' message place before 1.19 update are now treated. Long story short, all message edits that are editing plugin messages and not player chat should now work as before and unless I messed something up when adding 1.19 support, server owners should not actually notice any difference and should not need to update their message edits to work on 1.19 (unless they actually try to edit player chat, which is still no longer possible on 1.19 with Message Editor as per 2.4.11 update).