I’m not too surprised really. modding old games and the mod pack takes literal decades to finish. for example red alert 2, tiberium sun, CNC generals (and zero hour) just for the ones that interest me.
bugs exists. modders fix bugs. especially so for games that are still getting updates, even one as scarcely updated as Terraria. I recall some long time ago the Terraria devs said the game is “finished” and then later on some big anniversary year they released a surprise update. my memory is faulty so don’t quote me