They wouldn't care to buy even should the price falls to $20k because it's not in their agenda to buy bitcoin.
How many of the big countries are buying bitcoin, even the US with many promoters of bitcoin yet, what the government have in holding are ceased bitcoins.
The reality is that the government is not really interested in bitcoin, and that time is probably yet to come.
All the noise around a strategic bitcoin reserve is mostly speculation and market expectations rather than a clearly defined policy.
The US was the country that initiated and pioneered this idea, but look at this. They are only using seized Bitcoin to build the reserve and have no plan to actively buy more. Worse still, it was just an executive order. This means that once Trump's term ends, the strategic bitcoin reserve fund could also be abolished if the new administration is no longer interested in it.
I disagree, there are already half a dozen governments around the world who have decided not to sell their seized bitcoins. They keep getting criminals, get their crypto, and put it in one place. They do not even let it be where it is, they take it, and basically put it in treasury of some sorts, controlled by the government, their "wallet" so to speak.
And some even do not sell alts, they keep literally everything. So that is going to benefit everyone who does that, means more profit, less inflation, less taxes (or at least not more) and less money printing one day. And Germany probably already regrets not doing that, but they are Germany, and for them, it's to going to mean much, because they are already doing better than almost everyone in the world.