I was never aware of Dave’s script. It’s a very clever solution, but for me the sidebearing showing up at the start of a line is a kerning problem, and my kerning script deals with it:

https://creativepro.com/files/kahrel/indesign/kern.html

Did you check whether there are any paragraphs that end in a space (or more spaces even)? If there are any they would trip up the solutions suggested above. To delete any trailing spaces, use this query:

Find: +$
Replace with: <leave empty>

And for sport here’s yet another query to find paragraphs that don’t end in a period and insert a period:

Find: (?<!\.)$
Replace with: .