Shouldn't Democrats have been expecting this, though, and planned accordingly? Seems like Jeffries missed a big chance here.

Get out the flow chart

Republican does bad thing > blame democrats for not stopping it

About-to-retire Republican introduces articles of impeachment into an all-Republican congress months before it swings Democrat, Republican speaker rushes vote to ensure minority Democrats can't vote, it gets stuck in procedural hell, blame Democrats.

Literally only Stevens, who is effectively out of the party, has no valid reason for not voting.

Lou Correa — California: Will do medical procedure soon, doctor won't allow travel.
Frederica Wilson — Florida: The evening before, she was attending an inauguration ceremony of veteran homes in Florida.
Steven Horsford — Nevada: Personal emergency. Submitted statement to the record afterwards. Seems to have attended a press conference earlier in the day, so something urgent must have come up in between.
Julia Brownley — California: "As I and many of my colleagues were rushing to the floor to support Hegseth’s impeachment, Mike Johnson closed the vote before we could."
Jonathan Jackson — Illinois: Traffic incident, registered his vote to the record afterwards.
Laura Gillen — New York: Same as Jackson.
Melanie Stansbury — New Mexico: Same as Jackson.
Marilyn Strickland — Washington: Same as Jackson, "missed vote by one minute." Posted about impeaching Hegseth just hours before the vote.
Brittany Pettersen — Colorado: "Denied the ability," probably same as Jackson. Has previously been voting just weeks after childbirth, so she is not the one who bails.
Nancy Pelosi — California: Received lifetime award at a Veterans Day Celebration in her district.
Haley Stevens — Michigan: "[H]ung out during votes in the Republicans' restricted room off the House floor."

“didnt know” He absolutely knew.

And Jeffries should have communicated with them and had them on site.

Oh this isn't anywhere near the peak of republican fuckery.