Your findings are correct. This will probably be fixed in (one of) the next build(s) I would think.
With respect to your remark concerning codec-packs, of which
K-Lite's codec-pack is the most well-known, please note that by using codec-packs you might be tempted to install more than necessary. In this connection please note that
more surely
isn't equivalent to
better. To the contrary!!
A general advice re the use of codec-packs: The art is knowing to restrict yourself!
In most situations, you do not need to install codec/filter packs and
certainly not every codec/filter that comes with these packs. In fact,
you may run into problems if you install too many codec/filters on your computer.
It is highly recommended that you only install the codec/filters that you absolutely need. I would suggest anyone to follow this advice anytime! 