Looping a simple left-to-right animation with a changing speed?

There's a gap of variable size when the end meets the beginning. I can't get the speed just right. See the transition halfway through this video:

https://www.youtube.com/shorts/JEx4mJbBMek

A simple setup. A 3D space, with a wall and a few characters in front. I'm moving the camera from left to right, slowing down at each character. Pre-comose the whole thing, then putting one copy next to the other.

I'm fairly amateur at AE and I'm grateful for any help.