Attempting to run debugger produces command line with illegal @ symbol #1312

Environment

• Operating System: MacOS 10.14.6
• JDK version: 1.8.0_151
• Visual Studio Code version: 1.42.1
• Java extension version: Java Extension Pack 0.8.1

The issue is that upon launching a debugger, VS Code runs this command line:

~/Sync/projects/music/music-03:cd /Users/Mike/Sync/projects/music/music-03 ; /Library
/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home/bin/java
-agentlib:jdwp=transport=dt_socket,server=n,suspend=y,address=localhost:58363
-Dfile.encoding=UTF-8 @/var/folders/pn/3p41p2fj14d50n707c7x2p4c0000gn
/T/cp_90sfb6m3zinsbhwyvyknqb5hv.argfile ptcs.App

And I get this error:
Error: Could not find or load main class
@.var.folders.pn.3p41p2fj14d50n707c7x2p4c0000gn.T.cp_90sfb6m3zinsbhwyvyknqb5hv.argfile

I have no idea where the command line came from... as far as I can tell, it's illegal on Mac to use an "at sign" @ in the command line, and java is trying to interpret that as the main class, so something is wrong.

VSCode Version: 1.42.1
OS Version: MacOS 10.14.6

Steps to Reproduce:

Here is a project with the issue.

music-03.zip

Create Maven project in VS Code... install all Java extensions.

Work with project for several months, making many changes. Not sure what details are significant.
Try to launch debugger in maven project, using the default launch.json. I'm not using the "current file" one, but using the (Launch) - App config.

"version": "0.2.0",
"configurations": [
{
"type": "java",
"name": "Debug (Launch) - Current File",
"request": "launch",
"mainClass": "${file}"
},
{
"type": "java",
"name": "Debug (Launch)-App",
"request": "launch",
"mainClass": "ptcs.App",
"projectName": "music-03"
}
]

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