On its face, this seems like a dirty trick by Republicans. Mike Johnson called a recess, then after members left, called a snap vote on whether to proceed with impeachment with no warning. This entire spectacle reeks of a planned Republican scheme to try to influence the outcome through procedure and sow division within the Democratic party. The Republican House caucus was obviously made aware this was happening so they would stick around.
That any House Speaker can call a snap vote like this is a serious problem for our democracy.