Multireddits not working

Downloading of Multireddits (e.g. https://www.reddit.com/r/de+europe/) has stopped working and is giving a 404 not found error. The link works fine if I open it manually.

I think the issue is that the "+" gets converted to "%20". If I open the resulting link I also get a 404.

09:39:33.983 [AWT-EventQueue-0] DEBUG com.rarchives.ripme.utils.Utils - Key tray.hide in en_US is: Hide
09:39:35.347 [AWT-EventQueue-0] DEBUG com.rarchives.ripme.ripper.AbstractRipper - Found album ripper: com.rarchives.ripme.ripper.rippers.RedditRipper
09:39:35.353 [AWT-EventQueue-0] DEBUG com.rarchives.ripme.ripper.AbstractRipper - Found album ripper: com.rarchives.ripme.ripper.rippers.RedditRipper
09:39:36.495 [AWT-EventQueue-0] INFO com.rarchives.ripme.utils.Utils - Saved configuration to C:\Users\redacted\AppData\Local\ripme\rip.properties
09:39:36.495 [AWT-EventQueue-0] DEBUG com.rarchives.ripme.utils.Utils - Key queue in en_US is: Queue
09:39:36.496 [AWT-EventQueue-0] DEBUG com.rarchives.ripme.utils.Utils - Key queue in en_US is: Queue
09:39:36.611 [AWT-EventQueue-0] DEBUG com.rarchives.ripme.ripper.AbstractRipper - Found album ripper: com.rarchives.ripme.ripper.rippers.RedditRipper
09:39:36.612 [AWT-EventQueue-0] DEBUG com.rarchives.ripme.ripper.AlbumRipper - Using album title 'reddit_sub_de'
09:39:36.612 [AWT-EventQueue-0] INFO com.rarchives.ripme.ripper.AlbumRipper - [+] Creating directory: rips\reddit_sub_de
09:39:36.627 [AWT-EventQueue-0] DEBUG com.rarchives.ripme.ripper.AlbumRipper - Set working directory to: A:\ZA3Ref\Apps\ripper.\rips\reddit_sub_de
09:39:36.628 [AWT-EventQueue-0] DEBUG com.rarchives.ripme.ripper.DownloadThreadPool - Initializing Main thread pool with 5 threads
09:39:36.629 [Thread-3] INFO com.rarchives.ripme.utils.Http - Trying to load cookies from config for www.reddit.com
09:39:36.629 [Thread-3] INFO com.rarchives.ripme.utils.Http - Trying to load cookies from config for reddit.com
09:39:36.882 [Thread-3] ERROR com.rarchives.ripme.ripper.AbstractRipper - Got exception while running ripper:
java.io.IOException: File not found https://www.reddit.com/r/de+europe/.json: Status Code 404.
at com.rarchives.ripme.utils.Http.response(Http.java:221) ~[ripme-2.1.16-4-02372e85.jar:2.1.18-16-1342b621]
at com.rarchives.ripme.ripper.rippers.RedditRipper.getJsonArrayFromURL(RedditRipper.java:194) ~[ripme-2.1.16-4-02372e85.jar:2.1.18-16-1342b621]
at com.rarchives.ripme.ripper.rippers.RedditRipper.getAndParseAndReturnNext(RedditRipper.java:123) ~[ripme-2.1.16-4-02372e85.jar:2.1.18-16-1342b621]
at com.rarchives.ripme.ripper.rippers.RedditRipper.rip(RedditRipper.java:109) ~[ripme-2.1.16-4-02372e85.jar:2.1.18-16-1342b621]
at com.rarchives.ripme.ripper.AbstractRipper.run(AbstractRipper.java:671) [ripme-2.1.16-4-02372e85.jar:2.1.18-16-1342b621]
at java.lang.Thread.run(Thread.java:1447) [?:?]
Caused by: org.jsoup.HttpStatusException: HTTP error fetching URL. Status=404, URL=[https://www.reddit.com/r/de%20europe/.json]
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:912) ~[ripme-2.1.16-4-02372e85.jar:2.1.18-16-1342b621]
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:851) ~[ripme-2.1.16-4-02372e85.jar:2.1.18-16-1342b621]
at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:345) ~[ripme-2.1.16-4-02372e85.jar:2.1.18-16-1342b621]
at com.rarchives.ripme.utils.Http.response(Http.java:205) ~[ripme-2.1.16-4-02372e85.jar:2.1.18-16-1342b621]
... 5 more
09:39:36.885 [Thread-3] DEBUG com.rarchives.ripme.ripper.AbstractRipper - Waiting for threads to finish
09:39:36.885 [Thread-3] INFO com.rarchives.ripme.ripper.AbstractRipper - Rip completed!
09:39:36.886 [Thread-3] INFO com.rarchives.ripme.ripper.AbstractRipper - Deleting empty directory A:\ZA3Ref\Apps\ripper.\rips\reddit_sub_de
09:39:36.964 [AWT-EventQueue-0] DEBUG com.rarchives.ripme.utils.Utils - Key open in en_US is: Open
09:39:39.703 [AWT-EventQueue-0] DEBUG com.rarchives.ripme.utils.Utils - Key tray.show in en_US is: Show

Start with com.rarchives.ripme.ripper.rippers.RedditRipper, especially getJsonArrayFromURL and the call from getAndParseAndReturnNext, then inspect Http.response where the URL is fetched. Reproduce the request for /r/de+europe/ and trace where + becomes %20. Done means the multireddit URL reaches Reddit unchanged and no longer returns 404.