Blink works perfectly fine, except when I turn it off, it creates an invisible player sized entity client-side where I had turned it on and I can't do anything about it. It is just there, pushing you when you walk into it and not letting you interact with things behind it.

Since noclip doesn't work, I think you should make a mod that is similar to worldedit's "//thru" command. You should make it almost similar to clicktp but it actually goes through walls, or just give clicktp this ability. maybe make an option that says, "Through Walls" on clicktp.

Yes, I know you can use ".hclip" in the chat but I just want something simpler, something easy to use.

Spiders are visually glitched on the minimap and they extend to the left of them. In this picture you can see it on my minimap.

As you can see there is only one spider, not multiple making it seem large on the minimap.
I do have lithium installed, would be the cause?

I have tested it and it also does not work on 1.17

I recently changed the custom main menu GIF and I was wandering where the file exists so I can reset it.

please tell me where the GIF file is in my .minecraft directory or just attach it to this post if it isn't located there.

You should be able to close the Aristois GUI with the key that you open it with. So if you clicked right shift to open it, you should be able to close it with right shift as well, so you don't have to reach all the way to the escape key.

When I turn on inventory++ and put something inside of the crafting area, when I close my inventory it goes back into the actual inventory.

I use 1.16.5, vanilla launcher. Mods are WorldEdit and RoughlyEnoughItems. I tested it without those mods and it didn't work. I also tested it without the mods in the built in addons, and it still didn't work.
If i close my inventory in this picture, the dirt would go into the fifth hotbar slot.