In this one block: 000000000000101047a62b64d71a4fadc804777e5b99939bac5474f936bfacf9 there are no transactions for dev subsidy or PoW miners, just for the voters, which this time were only 3. Is that a bug of the software?
I'm not sure what you mean. The coinbase transaction of that block is 9248c242093bc69cbf2108c42e775cfb297caf51cd27711785a88bed2ecad768. It contains the dev subsidy (1.71141519 DCR) and the PoW subsidy (10.26849117 DCR -- remember it's 60% because the miner only included 3 votes).
Oh, Ok, I must admit that I wasn't aware of that. Is it written anywhere in the docs so that I can have some further info on that?