Environment variables for run configurations are not set when using host system JRE

No environment variables set in this menu are visible to the application:

This worked on a previous install through snap. Also configuring it to replace environment variables does not remove existing env vars:
```java
System.out.println(System.getenv().keySet());
```
```
[PATH, INVOCATION_ID, XAUTHORITY, LC_MEASUREMENT, LC_TELEPHONE, MANDAT....
```

Start by reproducing the issue in the run configurations menu with the host system JRE, using the Java environment-variable example from the report. Compare variables added or replaced in the menu with those visible to the launched application; done means configured variables are visible and replacement removes the existing values.

Rédigé par le modèle d'indexation à partir du texte de l'issue.