Help me understand why some 4K films dont list the Mbps?

[crazydrve]

Hello,

I am just barly getting into 4k and I am curious as to why some films dont list the Mbps?

Example...

https://www.blu-ray.com/movies/Alien-4K-Blu-ray/230308/

Alien 4K Blu-ray
40th Anniversary Edition
Video
Codec: HEVC / H.265 (49.32 Mbps)
Resolution: Native 4K (2160p)
HDR: HDR10+

Here is one that doesn't list the Mbps

https://www.blu-ray.com/movies/Close...lu-ray/171515/

Close Encounters of the Third Kind 4K Blu-ray
40th Anniversary Edition
Video
Codec: HEVC / H.265
Resolution: Native 4K (2160p)
HDR: HDR10

Is this just an inconsistency in listing or is there a reason for it?

Thank you
Bill