i dont know when this issue had popped up. this happen every so often with the electrostars is not even funny. (Last time it was with the 377/4, very same issue and it took until near end of TSW5 for it to get fixed...) How is it with every update somehow it affects the older trains? This is on the 387/2 DMOS (B) where these seats by the doors uses the exterior lighting instead of the interior lighting. You can clearly see the lighting differences in the pictures here. Can someone see is this the case on your end as well? PC preferably.
A similar issue used to occur on the 801s and it required a revamp to interior lighting, which they did do. Hopefully they'll fix this now it's been reported in a similar way, but it may well be we have to wait for a remaster. IIRC the 387 is going to be on GWE with the new remaster - paging DTG Liam so he is aware of this bug.