I don't believe governments are investing in Bitcoin because it doesn't make any sense. First of all, it's illegal in some countries, unregulated in most and it's just too unpredictable for a central bank to invest in.
Second of all, Bitcoin is about decentralization, going against central banks and everything they stand for, why would they invest in that?
All that apart, I do believe government individuals certainly invest and own lots of Bitcoins and other Cryptos, but that's not relevant.