I edited your post because the right side of the diff was missing. The <pre> html tag made the output too wide without adding a scrollbar. Markdown code blocks should work better, except now the indentation is wrong because of using tabulators.
Regarding /tmp, the tmp folder is part of the image already. The creation date on the folder should also be the same when using the same image, but it is different in your second output. If you used tmpfs somehow in the container, the date would be the date of creating the container. Since it is Jan 19, my guess is that ubuntu:focal was overwritten on the machine that gave you the second output or something else happened on the host to create tmp like this.
What do the following commands return on the host?
ls -ald /tmp
findmnt /tmp
When you share the output, please, use markdown code blocks the same way I edited your post and how I wrote the above code block like this:
```
ls -ald /tmp
findmnt /tmp
```
Moe info here: How to format your post: Markdown