When crafting basic circuits in a tier 3 assembler with 4 prod 2 modules (6% each, +24% total) after inputting the materials for 1000 circuits the crafts finished on the machine show 1239 instead of 1240, and the progress bar is at 99%.
Testing for up to 1M crafts showed no drop below 99% on the progress bar once finished.
Given how at 1M crafts, the amount of produced circuits is 1239999, I doubt this is an issue with the percentage set on the module.

