Probably fixed all the jittering, won't need the jitter guard anymore.

src/Game/Systems/PlayerMovementSystem.cpp

@@ -273,14 +273,10 @@ void PlayerMovementSystem::updateMovementControllers(double dt)
                     size = glm::vec3(1.f, 1.f, 1.f);
                 } else {
                     size = glm::vec3(1.f, 1.6f, 1.f);
-                    if (controller->CrouchingLastFrame() && player.HasComponent("Collidable")) {
-                        // Disable jitter guard so player doesn't get stuck in the ground.
-                        (bool&)player["Collidable"]["JitterGuard"] = false;
-                        if (isOnGround) {
-                            // The collision should resolve this anyway, but 
-                            // this is more reliable, since the box gets larger.
-                            ((glm::vec3&)cTransform["Position"]).y += 0.3f;
-                        }
+                    if (controller->CrouchingLastFrame() && isOnGround) {
+                        // The collision should resolve this anyway, but 
+                        // this is more reliable, since the box gets larger.
+                        ((glm::vec3&)cTransform["Position"]).y += 0.3f;
                     }
                 }
             }