For those interested in the technical aspects of the update, here are some key details:
The v1.53.115.1020 CODEX update was widely regarded as stable. It fixed many simulation and performance issues from earlier 2019 patches. However, users with large amounts of custom content (CC) reported minor conflicts with the new tanning system and CAS additions, which required updating CC skin tones and overlays. The Sims 4 Island Living Update v1 53 115 1020-CODEX