I thought you had to win the boosts to prolong them? We are able to prolong the boosts past the end of the conquest. Is this a bug?
Moving this to the bug section.
What is your alliance name and in-game name?
Alliance of ghosts
Looks like this bug returned. the server update back on November 6 was supposed to fix this issue.
You are right, you cannot extend the boosts past Conquest. This is a bug.