Resource Bundle save not working in Resource Bundle editor
Answered

Occurs after updating to IntelliJ IDEA Community 2020.
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Known issue, will be fixed in the next update, see https://youtrack.jetbrains.com/issue/IDEA-237258 for details.
I have 2020.2 installed, this issue still occurs.
Please report a new issue at https://youtrack.jetbrains.com/newIssue?project=IDEA with the sample project to reproduce and the logs (Help | Collect Logs and Diagnostic Data) attached.