I just encountered that issue as well, you can turn off GlobalShadows to fix it temporarily until Roblox fixes the issue.
I can confirm, same thing still happens.
It would help a lot if you could provide more info about it. I think the issue happened on Monday should have been solved, there might be other issues we need further investigation.
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Yeah, I made my own post about it. You can find it here:
https://devforum.roblox.com/t/surfacelight-gives-off-hideous-shadows/2189618/6
Oh hey, would you look at that, shadows have been broken yet again!
The shadow property on light sources is broken if you have more than one inside a part (note how both shadows have shadows turned on, but only the first one has shadows working for it).
I can confirm this happening when I tried to do the same thing. This happened when I tried to get the shadows to work properly.
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This is still an ongoing issue. The only technology that’s partially working is future, but even then it still leaks lighting and has shadow glitches.
my problem came when I wanted to light up my room by turning cast shadow off, but even when I did it kept casting a shadow, I used the method to change the transparency by a little which worked out but the issue is extremely annoying
This has been going on for almost 2 years and roblox didn’t fix this issue. Wow 
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They look like they work fine on my end:
You should upload a video or image to show that it’s still happening for you, because it looks like many people are using this thread like it’s reporting light leaking or some other random glitch, instead of the very broken issue it was trying to report, which were shadows disappearing when moving the camera around:
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This issue has returned and is lagging my studio making it nearly impossible to develop my game.
You should record a video and send it here then. Are the shadows flickering and rapidly disappearing then reappearing?
it happens when i look at something, but when i look away the shadow returns. but i fixed it by restoring an older version with the place version history. something corrupted the game, as i wasn’t even able to join it.
Also seeing a similar issue with our game. Only certain character models cast these extremely large and strange shadows.
https://gyazo.com/2d33137722abd25e16b3bebb8fe6882b
https://gyazo.com/a357acf3417db8518cf9c4f7e38c3b19
I think it has something to do with beams but its honestly hard to say for sure because ive messed with a few settings related to castshadow and have had varying results.
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I’ve just began experiencing this issue again 3 days ago, I was developing a lobby for a horror game and the shadows on certain objects began only casting upclose, with the shadows from said objects slowly disappearing as you get further away from them. Fastfoward to yesterday, and the shadows on many objects in my build have began glitching out and flickering depending on the angle that i viewed them (All objects in my build have CastShadow on.)
This has affected me both in-game and in studio. (Im on max graphics on both.)
This issue doesnt seem to affect any other of my builds that I have made in the past which use the same assets and similar lighting settings and only affects this build in particular.
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Its been 2 years and roblox is incapable of fixing this. Seriously?
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Were you able to find a solution to this? I’m running into the same problem.
I resolved the shadow artifacts issue in my game by enabling shadows on all meshes within the model. The problem only occurred with one out of 33 rigged models. Despite extensive testing, I couldn’t consistently replicate the issue across any other models, but the root cause was a rigged model with shadows disabled being parented to the player character.
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