When an animated mesh (does not have to have any animations enabled, having a skeleton is enough) is attached to a TagPoint added to a bone, the mesh lags behind the TagPoint.
It appears to be 1 frame behind the actual position of the TagPoint. It's very visible on running characters with animated hair. The problem might be that the meshes are not updated in the correct order, like if the tag point was updated accordingly to the outdated position of the bone and then the bone's position was updated. No idea why this affects only meshes with skeletons.
Linux (Ubuntu 16.04 64-bit), GCC, NVIDIA video card and driver