New maven submodule cannot be imported

[testforstephen]

Reproduce steps:

• Open VS Code and change the user setting to "java.import.projectSelection": "manual"
• Open the folder in VS Code https://github.com/eclipse-jdtls/eclipse.jdt.ls/tree/master/org.eclipse.jdt.ls.tests/projects/maven/multimodule
• When the popup dialog appears, choose Let Me Select... and select all projects to import. Wait for the language server to be ready
• New a folder named module4 in the root folder multimodule, and then new a pom.xml file in the multimodule/module4 with the following contents.

<project xmlns="http://maven.apache.org/POM/4.0.0"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>foo.bar</groupId>
		<artifactId>multimodule</artifactId>
		<version>0.0.1-SNAPSHOT</version>
	</parent>
	<artifactId>module4</artifactId>
	<packaging>jar</packaging>
</project>

• Modify the parent pom file multimodule/pom.xml and add the new module module4 as a sub module. The <modules> section should look like this:

<project ...>
...
	<modules>
		<module>module1</module>
		<module>module4</module>
	</modules>
 ...
</project>

• F1 -> "Java: Import Java Projects into Workspace". Select all projects to import.
• Go to the Java Projects view, and I don't see the new module is imported.