It would be quite embarrassing if Bayern lost. Just look at this.

Their odds are below 1.50, which means Bayern has a nearly 90% chance of winning, the bookmakers are very confident in Bayern, especially since they're the hosts here. I'm quite optimistic they can get all three points but betting on them to win outright isn't very appealing, the best bet is a handicap bet; I'm confident there will be plenty of goals in this match.
It would certainly be a shame if Bayern Munich lost to RB Leipzig, especially since they'll be playing at home, the Allianz Arena.
Bayern Munich are clearly favored by any measure, so it's understandable that bookmakers are offering odds of 1.24. The worst-case scenario is that the match could end in a draw, but that seems unlikely, especially after Leipzig's departure of one of their strikers, Sesko, who chose to join Manchester United
Xabi Alonso's departure was a heavy blow for Leverkusen fans, as they had grown to love the manager for his results over the past two seasons.
After he left, several promising players who contributed to Leverkusen's success last season also left, so I believe Leverkusen's performance isn't as strong as before, and Ten Hag has a tough job to do to restore Leverkusen to its former glory. Naturally, fans are enthusiastic about Ten Hag results, and Leverkusen's management has entrusted him with the job.
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More recently, Leverkusen sold their reliable striker, Victor Boniface, to AC Milan. They've completely sold their best players and are rebuilding their squad from scratch. I have no expectations that Leverkusen will be able to compete for the title or even maintain a top-four finish this season.