Google calendar can't grok holidays?

When I use the Google calendar in a browser on my desktop, I can see the two sets of holidays I've selected (US and Jewish) just fine. I used to see them on my Android phone, too. In September I noticed that it wasn't showing me Rosh Hashana, Yom Kippur, and Sukkot, but I was busy and didn't investigate. I don't remember if it showed me Labor Day.

I pretty much only need this information on phone when I'm out somewhere trying to schedule something a few months out. In other words, when I'm at a doctor's or dentist's office trying to schedule the next appointment.

I had a dentist appointment last week so this annoyance is fresh in my mind again. I found lots of trails from other people trying to solve this problem (DenverCoder9, what did you see??), but no working answers. And then, in poking around on my phone more, I saw that it does have an entry for Black Friday -- but not for Thanksgiving the day before. I didn't put that there, so it must be coming from the US calendar.

Where the heck are my holidays? Why is this hard, and what happened a few months ago to mess them up?