I will say that this is the first year I've had this situation so it isn't common. But I ended up paying more NJ taxes than I had to.
In addition to the TaxAct expert agreeing that it was a bug, the NJ GIT 5 instructions are quite clear:
"Most investment income is taxable in New Jersey as interest,
dividends, or capital gains.
However, some interest income is exempt from tax, including:
• Interest and gains from debt obligations of the federal government, such as U.S. Savings Bonds and
Treasury Bills; "
