Update: works with 24.04(beta) too, and problem still exists in 24.04.
This is how I got the Citrix Workspace client to run in Ubuntu 23.10 in Jan. 2024
Prior to version 2311 Citrix client, this patch was unnecessary, but at 2311 Citrix stopped launching successfully at all in i3.
In XFCE Citrix runs with "proper" full screen support, covering three monitors but