It's possible that I failed to find the right flag or setting to fix this, but I'm utterly at a loss, so the boolean "random_end_animation_rotation" is my best guess for the problem.
Attached minimum reproduction mods and saves for pre-and-post factorio 2.0 to showcase behavior.
Expected, pre-2.0 behavior: The beam ending is aligned with the orientation of the entity that has created the beam when random_end_animation_rotation is false (see orange arrow in below screenshot), and aligned randomly when it is true (green arrow below).
The graphics for the beam are defined in TestTurretBeam.ground_light_animations.ending, and are shaped as arrows in the attached mod
- pre2orientationrandomworkingasexpected.png (359.5 KiB) Viewed 117 times
Buggy, post-2.0 behavior: The beam ending is seemingly randomly-oriented every time the beam is created, regardless of how random_end_animation_rotation is set or the orientation of the originating-entity.
The graphics for the beam are now defined in TestTurretBeam.graphics_set.ground.ending
- post2orientationrandomnoeffect.png (554.8 KiB) Viewed 117 times
This is causing an ugly effect for my mod SearchlightAssault, where the spot light it casts no longer matches the turret (it looks especially bad in motion):
- feels.png (1009.63 KiB) Viewed 117 times