Maybe this can be considered a bug
When the sun is about to set, the beams of light flicker frequently.
The preliminary judgment is that it is caused by the cloud shadow. When this option is turned on, at sunset, Daylight will pass through multiple clouds, this, in turn, causes the beam to flicker constantly.
When the cloud shadow is turned off, This problem no longer arises.
Hopefully, the developers will be able to optimize this issue, such as adding a configuration option to Cloud Shadow so that clouds far away can no longer produce Cloud Shadow, and this issue may be fixed.
The specific video is as follows, It looks more obvious this way.

this is an unfortunate side effect of how the cloud shadows are calculated. you cant do anything about it besides turning them off.
i plan to hide it better in the next commit however, so stay tuned for that!