There doesn't need to be breaks in order to be considered a new "season". If that wasn't the case, One Piece, Naruto, and the like would just be considered one giant "season", yet are sold in "season sets".In this case not really haha The count of episode will continue as it is the same season on the format of long-running.
I would consider this a new season, especially if the original order was for 52 episodes, and then more episodes was ordered later.
And if we're talking about continuing episode counts, both MHA and AoT having continuing episode counts as well, yet have clear seasons.