Odd pattern in invalid capture jobs

[rebeccacremona]

In the pages of invalid capture jobs, we often see pairs by the same user, one "human", one not, where the "human" one lacks a url, and has an error message about it, and the non-human one has the url, but no message. What's up with that?

This is long-standing: I've noticed this right since introducing "invalid" capture jobs, which were added to support the link batch feature.

I have not yet reproduced locally; no errors result, when this happens.

[rebeccacremona]

Note: despite my suspicioncs, the link batch code does not seem to be implicated. The emails of the users belonging to these capture jobs do not appear in the list of users creating link batches. So, I now suspect a sporadic JS problem: many of these users are creating MANY links daily.