Matrix projects are not executing build steps on configured restricted nodes

Issue

When using a Matrix (Multi-configuration) project with the Advanced Project Options > Restrict where this project can be run enabled, but no axis defined under the Configuration Matrix section, the build steps will run on any available agent.

Environment

CloudBees Jenkins Enterprise (CJE)
CloudBees Jenkins Enterprise - Managed controller (CJE-MM)
CloudBees Jenkins Enterprise - Operations Center (CJE-OC)
CloudBees Jenkins Team (CJT)
CloudBees Jenkins Platform - Client controller (CJP-CM)
CloudBees Jenkins Platform - Operations Center (CJP-OC)
Jenkins LTS
Matrix Project plugin

Resolution

The Multi-configuration project is designed to execute the build steps on the next available build agent if a Configuration Matrix > Agents axis is not configured. The Advanced Project Options > Restrict where this project can be run only limits where the initial flyweight task may execute.

To configure where the build steps will run, configure a Agents axis with the desired build agents. For example, the following configuration shows how to execute the build steps on two agents testNode1 and testNode2: