I agree that their performance has shown a decline, but I think this is a very natural thing because they have confirmed themselves as Bundesliga champions this season. So they don't have any pressure to play as usual, because the match results don't affect them in the slightest. It's just that if they don't lose then they will extend their unbeaten record, and in my opinion that is Leverkusen's only motivation in their remaining matches in the Bundesliga.
It's also fair to say that they got lucky when they were able to score a goal in the final minutes of the match, so that prevented them from losing. But actually they usually do that during this season, they can always catch up so they don't lose and they can even turn things around in several matches. This is the most extraordinary thing from Leverkusen this season and honestly we can't deny that.
I don't see any decline in performance from Leverkusen, I think the two draws they got are quite normal because they were against strong teams in the Bundesliga and also Xabi Alonso made several player rotations because the brand no longer has any interests after successfully ensuring the Bundesliga title in These two matches Leverkusen showed something extraordinary when they scored a goal at the end of the match to avoid their first defeat this season, I watched these two matches and I couldn't believe what I saw, it was truly extraordinary and I thought the Leverkusen team didn't will be defeated this season.