This is what happens to me when I'm relatively near working windmill. If windmill is disabled (not working) I don't have such problems. I didnt have this problem with create-mc1.16.3_v0.3e.
Logs don't have anything interesting that is related to Create, But If you want i can upload them. Since I'm using modpack All The Mods 6 log is rather large.

Can confirm the exact same issue. No optifine running. No resource packs loaded except my GUI, the issue remains.
Using the current version.

This issue has been marked as stale because it has been inactive for 3 weeks. It will be closed if it remains inactive for another 3 weeks.

This issue has been marked as stale because it has been inactive for 3 weeks. It will be closed if it remains inactive for another 3 weeks.

This issue has been closed since it has been inactive for 3 weeks since it was marked as stale.

Update to v0.3.1a

Update to v0.3.1a

I have this problem on v0.3.1a.

do you have optifine on? if yes, try removing it

do you have optifine on? if yes, try removing it

I can't run optifine since it conflicts with some mods in the modpack.

well, idk then

Mind posting a screenshot with the F3 menu open for me to take a look at? Also you should be able to fix it by running the command /create experimentalRendering off

@Jozufozu you were right, I disabled this experimental rendering and all those weird lights disappeared.