Here is a video of Blue Cave Skip, which allows you to go from the first room of Blue Cave to Battlefield by activating a trigger out-of-bounds. The video shows a first consistent setup to get the trigger without softlocking the game (If you go too far to the right on the last part of the skip, you'll end up in a infinite fall state). This skip can only be done in Any% in theory, since you have to get Fire Aspect later in Blue Cave in 100% category. Shoutout to Ucci for being the first to perform it. I only found a way to make it consistent.

Update (24/03/2023): With a better understanding of this skip, I found a better way to do it. You don't have to jump above the second bloc after all, but you can use it to setup the last part of the trick. You can see the block being illuminated when Simona is above it. You'll use this to setup your next movements. You first need to use this light to position yourself a little bit to the right of the bloc. You can try it multiple times until you find the right placement everytime. After doing this setup, do 4 dashs to the right (While not pressing the right arrow at the same time). If you did the setup correctly, you should automatically activate the trigger. If not, just do a little tap to the right and you should get it.