Pennsylvania

That is complete bullshit.

In Washington state (all vote-by-mail) if you don't use the secrecy envelope, the only consequence is that the machine that slices open the outer envelope is more likely to (barely) slice the folded part of the ballot, requiring the person who opens the ballot to tape it back together so it will go through the scanner properly.

When pulling ballots out of the envelopes, the openers are doing things very quickly and making two stacks (one of outer envelopes, one of ballots in secrecy envelopes). When they come across a ballot that is not in a secrecy envelope, it gets tossed into a third pile (since they're more likely to need tape). The opener is not going to stop and read the name on the outer envelope and then go through the ballot to see how that person voted. They're trying to open as many envelopes as possible in the shortest possible time. But, if they did, it would be noticed by other workers or the supervisor.

Also, Washington State law states that if a person actually signs or otherwise puts their personal information on the actual ballot, that will not disqualify the ballot from being counted.

Disqualifying a ballot just because voter secrecy "might" be compromised is just another BS reason to disenfranchise people (probably because they know who they're most likely going to be disenfranchising).