Maven style builds (which use the maven integration plugin) do not load or respect .mvn/*.config.

This is not to be confused with a previous issue with Maven itself where -f could not find .mvn. That is freestyle builds work fine and even executing maven pre or post steps work fine.

An easy way to test this is to create a project with .mvn/jvm.config or .mvn/maven.config with some property defined like
-DsomeProperty=Hello,World
 
Then run Maven with the following goal:
mvn org.apache.maven.plugins:maven-help-plugin:3.2.0:evaluate -Dexpression=someProperty

Expected Results

Hello,World

Actual Results

null object or invalid expression