Original source: https://www.awkwardzombie.com/comic/full-circle
PS: Whenever this happens (and let’s be honest, we ALL did that at least once…) you can simply save & reload right there and then.
Rocks, boulders and other Korok Puzzle elements do not have a respawn cooldown - every time the zone is reloaded, they will be back at their starting position, and since you just saved, Link will be at the same spot too (instead of you loading an old autosave and then having to climb the mountain again or something like that…) This does not require a Blood Moon.
You can also just be sure to always carry a weapon or shield with a rock attached. You don’t have to drop it or draw it, its position is counted even from your back.