Steps to reproduce the issue

Create a simple custom banner with css and html. This is my example:

Enter the click url (any proper url should work, i.e. https://kravfighter.co.nz/)
Create Banner Module and assign it to a banner module position.
Clear cache
Refresh the page

Expected result

Banner is showing in the right position, and when you click on it, you're taken to a website specified in the click url.

Actual result

There is no click url on the page, so clicking on the banner does nothing.
This is the excerpt from the code of the page:

System information (as much as possible)

Joomla 3.9.1 - tested on Protostar Template and on JF-Simone Gantry 5 template. SEF urls enabled.

Additional comments

Div tags were removed from all the above code examples and I don't know how to show them here.