When you install both business-central and kie-server and proceed to configure kie-server properties the default placeholder that is shown is not correct.

What is shown:
> "http://localhost:8080/controller/rest/controller"

What should be shown:
> "http://localhost:8080/business-central/rest/controller"

In default scenarios the value is correct.

Workaround: Navigate to your EAP and update standalone-full.xml and standalone.xml. Look for org.kie.server.controller property and update it to what you need