We distinguish between seasons, closing days and blackout days. All annual passes are valid during the regular season (excluding WinterWonder LEGOLAND). On closing days the park is closed to all visitors. Information on season times and closing days can be found here.
Only the LEGOLAND Annual Pass Basic is affected by blackout days. This pass has been offered as a new purchase or extension price option since the end of November 2022, so you actively opt for the pass with blackout days. Existing annual passes are not affected.
The fact that the "old" LEGOLAND Annual Pass (without days off) and the "new" LEGOLAND Annual Pass Basic (with days off) both cost 79 EUR is irrelevant.
You can find more information about the blackout days of LEGOLAND Annual Pass Basic here.