When setting a module's position. Not all of the positions that are available on the template are shown in the dropdown. Namely, the message and component positions are not showing.
this was noticed when attempting to place a custom module on the component position of the contact us component page assigned only to the contact us menu item.
See screenshot in the link below.
https://www.awesomescreenshot.com/video/6819379?key=4e0a8995a8a0fdbc8a7b70b7684dab86