I'm not sure if something has changed or not with the bag filters. I no longer have a reagents section and a reagents bag section, everything is just the reagent bag. I have a character that does not have a reagent bag that has reagents in their bags and they are not appearing at all in my bags. If I go into the bag options and shut off the Filter trade goods, then all the items appear. When I turn it back on the items disappear.

On my main character with a reagent bag, I have a 26 slot reagent bag and I have 60 different reagents and they are all showing under the Reagent bag in my bags sections.

My version is 8.2.0 (TWW)

Reagents are now combine with reagent bag, which in on purpose.
And reagents missing for those character without reagent bag, has been fixed in recent commits.