errors on unpublished script??

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We have a line-item script that we've run one and off for months without issue. Yesterday at around noon, we started seeing 1-4 errors being thrown from the script on almost every order. I duplicated, made some edits (see below for technical details) and published the updated script. The new script is almost identical, but has an added data-type check so that the  array method 'join' is not called on inappropriate data-types. SInce the change, we've seen no errors on the new script, but I DO see about 100 more errors on the unpublished  script that have occurred since un-publishing. I kept records shwoing that  at the time the script was unpublished there were around 230 errors, this morning I see over 300.  How is this possible if the script is not published? One of my concerns is that if the error reporting is so inaccurate that I just disregard when errors happen, how will I know if it is serious? The other is that I don't understand how this is possible?
I was never able to replicate the error in the debugger, so I am not even 100% confident that my modifications is the reasons that the updated script, now published, is not throwing similar errors.

Here is the error:

Screen Shot 2020-07-21 at 4.33.41 PM.png

 Here is the original script:


Screen Shot 2020-07-21 at 4.35.36 PM.png

Screen Shot 2020-07-21 at 4.35.52 PM.png

 Here is the updated script- the updarte is on linen 11 and 13:

Screen Shot 2020-07-21 at 4.37.03 PM.png

Here is the original script in the debugger showing "no errors" with the exact same input that originally triggered one of the many many errors:

Screen Shot 2020-07-21 at 4.31.31 PM.png