Binary system lighting issue [1.7.0]

[arbodox]

Not sure if this issue has already been fixed, but this occurs in the Feb 2022 build of 1.7.0 posted in the forum: https://celestia.space/forum/viewtopic.php?f=4&t=21805

In a Sun-orbiting binary system where the barycenter is situated inside one component (component's semimajor axis from the barycenter is smaller than its own radius), the lighting on that component is rendered incorrectly; the component appears to be reflecting light from the barycenter instead of the Sun. This issue happens regardless if you define the barycenter as a "ReferencePoint" or an "asteroid", "planet", or "dwarfplanet" with an albedo of 0. Here's a screenshot illustrating this: https://media.discordapp.net/attachments/558643969307967504/1031238018692026418/unknown.png?width=2645&height=1326

This issue has been brought up by mobi users as well: https://celestia.mobi/resources/item?item=35DD15C3-F872-8561-4302-45B7FD337221

Desktop:

• OS: Edition Windows 11 Home 22000.1098
• Version: 1.7.0 (Feb 2022 build from https://celestia.space/forum/viewtopic.php?f=4&t=21805)

[375gnu]

One object reflects the Sun light and so lightens another one. But of course implementation of this is not realistic.