jump climbing fix

src/physics/PhysicsSolver.cpp

@@ -25,7 +25,8 @@ void PhysicsSolver::step(
 	float dt = delta / float(substeps);
 	float linear_damping = hitbox->linear_damping;
 	float s = 2.0f/BLOCK_AABB_GRID;
-
+    
+    bool prevGrounded = hitbox->grounded;
 	hitbox->grounded = false;
 	for (uint i = 0; i < substeps; i++) {
 		vec3& pos = hitbox->position;
@@ -37,7 +38,7 @@ void PhysicsSolver::step(
 		vel += gravity * dt * gravityScale;
 		if (collisions) {
 			colisionCalc(chunks, hitbox, vel, pos, half, 
-                         (gravityScale > 0.0f) ? 0.5f : 0.0f);
+                         (prevGrounded && gravityScale > 0.0f) ? 0.5f : 0.0f);
 		}
 		vel.x *= glm::max(0.0f, 1.0f - dt * linear_damping);
 		vel.z *= glm::max(0.0f, 1.0f - dt * linear_damping);