bug kind say recipe set 50000 stack but item factory 3 is unstackable

I think you need to report that to the actual transport drones dev (https://mods.factorio.com/mod/Transport_Drones_Continued_Fixed). This compatibility mod just enables the drones for nullius. I don't believe I'm doing anything with stack sizes. I'll look later, but I'd suggest reporting it there so long.

It may speed things up for the drones dev if you also try with factorissimo without nullius, and confirm its the factorissimo-2-notnotmelon fork.

transport mod has function that if item is not stack able than stack size set 1 .
that error is become this mods final-fixes, recipe result 50000 no matter item is stackable or not
moreover, transport drone mod has some special function that it work with factorisimos factyory throwable fucntion, why it not compatable

Yup, you are correct, it is in the final-fixes. I'm testing a fix now. As for why: its because for nullius we need to change many item names & recipes and its being a bit overzealous. I'll reply here when its updated

Seems to be working now. I can load factorissimo and can see the stack sizes there are still 1. (I'm checking the not-stackable flag).

Hopefully this works for you now?