Is Tenjiku arc of Tokyo Revengers season 2 part 2 or season 3?

Is Tenjiku arc of Tokyo Revengers season 2 part 2 or season 3? I'm pretty confused about it. Many sources are saying it's season 2 part 2 and many sources are saying it's season 3. Such as, when I asked ChatGPT and AniList etc. it said that it's season 2 part 2. And when I asked Grok AI, it said it's season 3. I used to think that the Tenjiku arc is the second cour of season 2 or something but I'm genuinely confused at this point

Also, if it really was season 3 and not season 2 part 2, why would it have the same opening as the previous arc? I find it unlikely that a new gen anime would put the same opening for straight up two seasons. So I think, it is season 2 part 2 not season 3