I can't find anyone else who's had this issue. Over months of trying, I've never been able to use the Create mod for whatever reason. Among other critical issues (such as whole worlds corrupting and becoming inaccessible whenever the player falls between two crushing wheels), my player passes through any blocks that move, as you can see in this video I recorded of the issue. (Too large of a file to upload straight to GitHub.)

Things I've tried:

1. Restarting Minecraft
2. Restarting my computer
3. Uninstalling and reinstalling the Create mod
4. Removing all other mods
5. Reinstalling Forge
6. Reinstalling Minecraft
7. Completely deleting my .minecraft folder and making a new one

This mod looks amazing and I really want to try it, but because of issues like this I simply can't. There's nothing wrong with my PC, all other mods work perfectly and it's only around six months old. I can't find any documentation online of this issue either so I have absolutely no idea why it's happening.

I've attached the log file of the same play session I recorded the video in if it would be any use to you. Any help with this issue would be greatly appreciated, because I really want to try this out.

Swap to Optifine G6, this is a known bug with other versions of Optifine

Weird, I was using G6 before, but I redownloaded it and it's working again. Thanks for the help! A notice on curseforge or something would be nice though for sake of clarity.