Was using this on a 1.20.1 Aternos server with friends, and noticed a small issue with the glowstone filter being consumed, but we just ignored it and just got more glowstone.

A larger issue has now been identified that the brewing of advanced potions has stopped working - gunpowder, glowstone and Redstone upgrades to potions e.g. strength II. These items are consumed in the brewing stand without actually upgrading the potion.