I'm using Twinmotion 2023.1 Preview 1 on an M1 Max MacBook Pro. One thing I've noticed since going from TM 2022.2.3 to the version mentioned is that most surfaces (especially vegetation) shows so ...

Development Getting Started & Setup
,
2

please see here: https://twinmotionhelp.epicgames.com/s/question/0D54z00008orugJCAQ/vegetation-turned-dark-after-upgrading-to-newer-twinmotion?language=en_US