When using the pencil tool to edit existing lines, instead of a smooth transition at the start and end of the edit, it's always a little jagged no matter how carefully I draw it. Toggling and using the smooth tool afterwards helps, but that adds an extra step every time I use this tool to edit lines. The 2020 version didn't have this problem, and I compared my pencil tool settings between the two versions and they were the same. Even tweaking the settings on the 2021 pencil tool doesn't resolve the issue.

Pic attached showing a line after I edited it once with the pencil tool, being careful to make smooth movements while drawing, and the beginning and end of the edit (circled in red) have a little wiggle (it's tiny but very crucial in the scale I work in!). This wiggle would have been automatically smoothed out in previous Illustrator versions.