Seems more reliable than the original method but not perfect

assets/blockout_2.tscn

@@ -645,6 +645,7 @@ health_drop_enabled = false
 
 [node name="Player" parent="." instance=ExtResource("9_3usor")]
 transform = Transform3D(1, 0, 0, 0, 1, 0, 0, 0, 1, -0.137423, 1.78365, 12.8627)
+AUDIO = false
 
 [node name="WorldEnvironment" type="WorldEnvironment" parent="."]
 environment = SubResource("Environment_b2qms")

assets/bullet.tscn

@@ -84,7 +84,7 @@ collision_mask = 109
 axis_lock_angular_x = true
 axis_lock_angular_y = true
 axis_lock_angular_z = true
-mass = 0.1
+mass = 0.01
 center_of_mass_mode = 1
 continuous_cd = true
 contact_monitor = true