Numbers for Mac polynomial trendline not showing all terms

Hi,

I'm using 5th and 6th-order polynomial trendlines in my chart. I have displayed the equation, but it only shows up to an x^4 term. For 3rd order, it shows x^3..x^0 terms, for 4th order, it shows x^4..x^0 terms. These are as expected, but for 5th order and 6th order, it still shows only x^4..x^0 terms. The coefficients on these terms change, so the underlying trendline equation is changing, and the trendline curve on my chart fits my data better, but it's not showing the higher-order coefficients. I'm thinking this is a bug, but before I send Apple feedback, I thought I'd ask here.

Also, while I don't think this is a bug, it's annoying. When a coefficient can fit into four decimal places, it doesn't display scientific notation. For example, 0.0004. The problem is that if this coefficient is on a higher-order term (e.g., x^4), then the values the equation produces can be very sensitive to the lack of significant figures. I actually wish I could control how many significant figures it displayed. I'd love a function that would return an array of coefficients. Oh well.

I'm running macOS Catalina 10.15.3 and Numbers 6.2.1.

Best, Eric