Shell/terminal no longer registers premature input text

Suppose I'm waiting for a long running command to complete.

Before I was able to type the 2nd command, and the entered text would be preserved when the 1st command completed and the prompt returned (and would even execute the 2nd command if I had pressed enter).

This no longer happens and I don't remember updating zsh, iTerm Mac OS client or anything in my Ubuntu Server.

I'm not sure what to Google for, I can't quite think what search terms to use. And my tags may be misleading. I hope someone can point me in the right direction

Example A: 2nd Command executed

Desired

$ sudo zfs create -o mountpoint=/media/me/disk pool_my/disk(long pause)sudo chown me /media/me/disk<enter>$ ls -ld /media/me/diskdrwxr-xr-x 2 me me 2 Sep 18 21:37 /media/sarnobat/videos_10G

Actual

$ sudo zfs create -o mountpoint=/media/me/disk pool_my/disk(long pause)sudo chown me:me /media/me/disk<enter>$ ls -ld /media/me/diskdrwxr-xr-x 2 root root 2 Sep 18 21:37 /media/sarnobat/videos_10G

The 2nd command wasn't executed.

Example B: 2nd command text preserved

Desired

$ sudo zfs create -o mountpoint=/media/me/disk pool_my/disk(long pause)sudo chown me /med$ sudo chown me /med

Actual

$ sudo zfs create -o mountpoint=/media/me/disk pool_my/disk(long pause)sudo chown me /med$ 

The incomplete command I began typing before the previous command finished is gone.