Yup. From the latest DOJ statement, it seems like:

9 military voters sent write-in absentee ballots to Luzerne.

Because these letters weren't in SC-mandated privacy envelopes, Luzerne officials thought they were *requests* for absentee ballots. They opened them, spoiling them. https://twitter.com/rgodfrey/status/1309282545855537157

Here's that DOJ update https://www.justice.gov/usao-mdpa/pr/letter-luzerne-county-bureau-elections

Pretty clear the problem here wasn't absentee voting, which is routine for military personnel, but rather the new (and controversial) ruling that requires ballots be placed in privacy envelopes. More on that: https://www.lehighvalleylive.com/elections/2020/09/voting-by-mail-in-pa-dont-forget-to-use-the-secrecy-envelope-to-avoid-electoral-chaos-official-warns.html

8 hours later, the Trump spokesman's instigating tweet—"Democrats are trying to steal the election"—is still posted, with 67,000 retweets/likes and counting.

This sort of disinformation is going to get innocent people hurt.