What is the current path you have for the Chrome app? I know with apps that have spaces in the name there can be issues… You can try:

file:///Applications/Google%20Chrome.app/

And see if that works. Thought knowing what you currently have configured will make it easier to help you troubleshoot.

To confirm that what Emily said is correct, I just checked our layout and that is how it looks for ours.

I am having the same issue, even though he path is exactly what you guys said it still shows up as a question mark. Jamf doesnt seem to have a solution either. This only occurs with chrome (wich sucks since we use it for almost everything) . Any new ideas?

Many of us are using DockUtil for this reason. It also give more control.
https://github.com/kcrawford/dockutil

+1 for dockutil.