the rub is that they are being paid for 5 days, by the tax payer and only reason they were given the extra day was so they could rest and be more productive on their actual workdays.

so, while not a breach of any contract, the optics are terrible and normal, working people are, understandably, pissed.

in a logical world, we would say, ok, since I'm paying you 5 days, and you're only working 4, but don't need the extra rest after all, now come back on the 5th day