Limited Goods Restocking

I would occasionally find that limited goods fail to restock on the 2-hour marks, or even 30 minutes before and after. The prices of them don't change at all throughout the entire time indicating that they're not simply being purchased instantly. Additionally, this appears to happen randomly, hours I have found them restocking I also find them not doing so at all. Has anyone encountered similar phenomena or can locate an exact cause?

And yes, I'm basing this off PST time.

I found a while ago that, every 2 hours items restock but one random hour a day is skipped for some reason. Is this what you've been noticing? I have not yet noticed multiple skipped double-hours per day yet.

I believe that's what it is, I haven't encountered it multiple times in a single day either though.
EDIT:
So does that confirm this as a fact? Or should it be considered a bug and put into the respective page(s)?

If it's a bug or intentional, idk. But I'd like more people confirming this before we include it anywhere.

It's an artifact of the way limited trade goods work.

The limited trade goods only restock from 0:00 to 0:05 every 2 hours. They restock at the same time as the normal goods within this time frame.

If, for whatever reason, no restock occurs in that time frame, the limited goods will not restock.

That brings up a question, why wouldn't normal goods restock then? They're already full?

Normal goods restock at MOST every 5 minutes. For reasons I don't know, it takes between 5 and 6 minutes from one restock to the next.

So one possible way is for this restock to occur at just the wrong time. Anything else that causes the restock to be delayed could cause this as well (like a server malfunction).