The fairylights seem to flash, and for lit lights the outer "light" transparent part glitches in and out when you look at it directly/out of the corner of your eye. I'm not really sure how to explain it. This only happens with OptiFine installed. I've attached an image of "Red Candle Lantern Lights" hanging but this also happens if it isn't crafted into hanging lights.

I'm using Forge 1.16.5-36.2.0, Fairylights 1.16.5-4.0.5, and OptiFine 1.16.5_HD_U_G8.

This didn't happen previously but as far as I can tell, it only started happening when I updated to Forge 36.2.0 (the mod and OF's versions have remained the same).

Here's more images.

Hi, I've managed to fix it! I had anisotropic filtering on, which was causing the problem. Turning it off has solved it.