resources removed from target/classes/ after editing just maven dependencies (regression)

[basinilya]

After editing the <dependencies> section in pom.xml (but not the other parts) and saving the file the resources are removed from target/classes (.class files stay there). To bring the resource back, a meaningless edit (a whitespace change) is sufficient in either pom.xml, a java file or a resource file. Having combined or separate java and resources folders does not make a difference.

It's still the case in Eclipse 2023-12 with m2e 2.4.300.20231203-1234 updated from latest.
I first noticed it in Eclipse 2023-09 with m2e 2.4.100 and it was working fine in Eclipse 2021-03 with m2e 1.17.2.

To reproduce, create a maven project with jar packaging, default layout, and create one resource file and one java file. Edit pom.xml by adding or removing a dependency. Go to target/classes/ and see that only the .class file is there. Edit pom.xml again and see that the resource and the manifest are created. Example pom:

<?xml version="1.0" encoding="UTF-8"?>
<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/maven-v4_0_0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>org.foo</groupId>
	<artifactId>m2e-bug</artifactId>
	<version>0.1-SNAPSHOT</version>
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
	</properties>
	<dependencies>
		<!-- uncomment: -->	
		<!--
			<dependency>
			<groupId>commons-net</groupId>
			<artifactId>commons-net</artifactId>
			<version>3.8.0</version>
		</dependency>
-->
	</dependencies>
	<build>
		<plugins>
			<plugin>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.8</source>
					<target>1.8</target>
				</configuration>
			</plugin>
		</plugins>
	</build>
</project>

eclipse-configuration.txt

[HannesWell]

Duplicate of #1511

[HannesWell]

Thanks for this issue, but it looks like this is a duplicate of #1511.
I'll close this as such, please follow that issue for updates.
If you think this isn't a duplicate please let me know and reopen this.