The satchel does not seem to open if im using a keybind from an extra mouse button(button 4) until after i open my inventory. If i use a keyboard bind it opens just fine outside of my inventory. It's not just occultism with this issue, other mods seem to not work with the mouse buttons properly. I tried to record this, not sure if it is understandable since u cant see the keypresses. https://gyazo.com/abc3b3aa76f19a40957f7f49fae3e3c0

sophisticated backpacks mod seems to work with my mouse keybinds, so they must be defining them differently. Which i think can be found here: https://github.com/P3pp3rF1y/SophisticatedBackpacks/blob/e3715f27c874146acb4bc73d6578d413a2b2180f/src/main/java/net/p3pp3rf1y/sophisticatedbackpacks/client/ClientProxy.java

it also opens the backpack even if not in curio slot which is not possible with the satchel currently. (if multiple backpacks are present, it chooses the first one in the curio slot first, then falls to hotbar/first one in inventory left right/top down if curio isnt present) But this isnt a big deal.