basically, the secondary ingredient input to the right of the ui is still filled with whatever potion youre brewing

i mentioned this as a side point for a 1.25 bug report, but seems to still be around in 1.26 - unless things have changed as far as chorus fruit negating the deficits of adding overclockers to adv incubators

i assume your fix for collecting the processing drops after harvesting has fixed this also as you mentioned the whole shift clicking stacked potions is fixed as well?

Yes, this is fixed in 1.27 as well with the re-write of the shift-click.