diff --git a/servers/rendering/storage/mesh_storage.cpp b/servers/rendering/storage/mesh_storage.cpp
index a495eac8b4e..9367f762c35 100644
--- a/servers/rendering/storage/mesh_storage.cpp
+++ b/servers/rendering/storage/mesh_storage.cpp
@@ -258,7 +258,20 @@ void RendererMeshStorage::multimesh_set_buffer_interpolated(RID p_multimesh, con
 void RendererMeshStorage::multimesh_set_physics_interpolated(RID p_multimesh, bool p_interpolated) {
 	MultiMeshInterpolator *mmi = _multimesh_get_interpolator(p_multimesh);
 	if (mmi) {
+		if (p_interpolated == mmi->interpolated) {
+			return;
+		}
+
 		mmi->interpolated = p_interpolated;
+
+		// If we are turning on physics interpolation, as a convenience,
+		// we want to get the current buffer data from the backend,
+		// and reset all the instances.
+		if (p_interpolated) {
+			mmi->_data_curr = _multimesh_get_buffer(p_multimesh);
+			mmi->_data_prev = mmi->_data_curr;
+			mmi->_data_interpolated = mmi->_data_curr;
+		}
 	}
 }
 
@@ -337,6 +350,9 @@ void RendererMeshStorage::update_interpolation_tick(bool p_process) {
 
 			// ... and that both prev and current are the same, just in case of any interpolations.
 			mmi->_data_prev = mmi->_data_curr;
+
+			// Update the actual stable buffer to the backend.
+			_multimesh_set_buffer(rid, mmi->_data_interpolated);
 		}
 
 		if (!mmi) {