Applying a Quick Latch onto the quiver and giving it an ample supply of arrows doesn't seem to work.
Additionally, Tetra's toolbelt seems wholly inaccessible in the Botania/Curios 'bauble' system.

I added the "Direwofl20 1.16" version in the title as I'm about 50/50 on whether this is a Tetra issue or a Direwolf issue, but it's worth looking into at least.

Needs to be updated to use the template for bug reports.

Just for clarifications sake, did you have an item in your offhand when trying to use the bow & quicklatch belt quiver? And if so, have you tried it without an offhand item?

Closing since this has been in need of an update for over a month.