Bonus symbol missing?

Spinning a certain Egypt-themed slot for a while and noticed I keep getting the same reel positions over and over but the bonus symbol just doesn’t show up anywhere, not even a tease. I know some slots have symbol blocking or certain payline restrictions but this feels a bit off compared to the usual odds I see, even in volatile games. No big wins or features, just a straight base game grind.

I track my sessions and after about 400 spins there were zero bonuses or even two on a screen at once, which is really rare for this game in my past experience. Anyone else see this kind of cold streak or do some slots throttle bonus frequency after a win streak? Looking for theories, not tinfoil hat stuff.