Fixes missing process_state error in blend spaces.

(cherry picked from commit 250e69856e10ac3290127753caffe4a6d8826606)

scene/animation/animation_blend_space_1d.cpp

@@ -380,7 +380,13 @@ AnimationNode::NodeTimeInfo AnimationNodeBlendSpace1D::_process(const AnimationM
 				Ref<AnimationNodeAnimation> na_c = static_cast<Ref<AnimationNodeAnimation>>(blend_points[cur_closest].node);
 				Ref<AnimationNodeAnimation> na_n = static_cast<Ref<AnimationNodeAnimation>>(blend_points[new_closest].node);
 				if (na_c.is_valid() && na_n.is_valid()) {
+					na_n->process_state = process_state;
+					na_c->process_state = process_state;
+
 					na_n->set_backward(na_c->is_backward());
+
+					na_n = nullptr;
+					na_c = nullptr;
 				}
 				// See how much animation remains.
 				pi.seeked = false;

scene/animation/animation_blend_space_2d.cpp

@@ -557,7 +557,13 @@ AnimationNode::NodeTimeInfo AnimationNodeBlendSpace2D::_process(const AnimationM
 				Ref<AnimationNodeAnimation> na_c = static_cast<Ref<AnimationNodeAnimation>>(blend_points[cur_closest].node);
 				Ref<AnimationNodeAnimation> na_n = static_cast<Ref<AnimationNodeAnimation>>(blend_points[new_closest].node);
 				if (na_c.is_valid() && na_n.is_valid()) {
+					na_n->process_state = process_state;
+					na_c->process_state = process_state;
+
 					na_n->set_backward(na_c->is_backward());
+
+					na_n = nullptr;
+					na_c = nullptr;
 				}
 				// See how much animation remains.
 				pi.seeked = false;