Yes, it's the light stalk.
You can't even buy the US version as it doesn't have the rear fog light setting on them, so you have to buy the export version which is probably $$$.
If you do buy it, let us know how much it cost you.
I have the same issue for more than a year and when it happens, I hit the stalk from the end (inwards towards the steering column) until it disappears and it goes like that for ages. So I've managed to live with it without forking any extra $$$.
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