After the most recent update the reagent tracker is no longer showing arcane powder count, options for arcane powder, or buying arcane powder as previously configured.

It looks like what is missing is Arcane Brilliance (Rank 3) (spell ID 43002) and Ritual of Refreshment (Rank 2) (spell ID 58659).

Those spell additions look good, I’ll merge that PR shortly - thanks!

Thing is, them being missing shouldn’t cause the issue you’re describing. I assume you still have AB rank 1 and 2 and RoR, so the addon should pick them up and track the reagent.
Have you tested your changes, do they fix things?

I'm not sure why it disappeared because I have had those spells for a long time now. I did test out the change and I was able to see the reagent option show back up. After the change, the addon is working as expected.

The reason I believe it stopped working is because I had unchecked "Show all spell ranks" on spellbook. After reverting my change and checking that option to show all spell ranks the addon is working as expected. Below is showing the behavior with the checkbox checked/unchecked with my change to the file reverted to before my change.