This bug's been around for a while, so I'll make a report.
What happens is that, when a player either disconnects or stays disconnected from the beginning of the match, the Host takes a much longer than normal time when interacting with objectives. Things like pulling a lever, or overloading something with Aleph, or even extracting, can take 15-20 seconds of continuous channeling to complete.
The other players aren't affected by this, just the Host.
It's quite annoying when this happens on Hanging by a Thread or A Low Blow, since it's pretty hard to extract.