Gold will be an option in maintaining value that does not have high fluctuations, bitcoin still has high fluctuations so that most governments and institutions make more purchases of gold than bitcoin even though today we see some countries making purchases of bitcoin but little of the portfolio they share to buy bitcoin.
As far as I know, except for El Salvador, no government has bought bitcoin and it's all just rumors. And given the current situation, they will say “No” even more to bitcoin, an extremely volatile asset that is likely to be dumped even further if the economy takes a turn for the worse.
There were talks about central Africa getting some, but yeah you are generally right that they do not "buy" it. However, it is good to remember that they do seize bitcoin all over the world, not just one or two nations, but every nation does that when they can, and sometimes they hold it, and sometimes they sell it.
Germany for example sold bunch of bitcoins for a very cheap price, they must be feeling regret about that, but they had some and sold it which proves that while they may not buy it, they still do get it by seizing it. I agree on gold being a safer place to put money into, specially if you are a government, but this doesn't mean that they are all turning their backs on bitcoin, they are looking into it as well.