Validator shows waterway ends warning with waterway=stream_end on final node

[guytoronto]

What steps will reproduce the problem?

1. Create a stream.
2. Tag the last node of the stream waterway=stream_end
3. Run validation

What is the expected result?

No validation error.
Validator should recognize the final node with tag as a proper end of the stream.

What happens instead?

Validation warning: Waterway ends without a connection to another waterway or the direction of the waterway is wrong. (1)

Please provide any additional information below. Attach a screenshot if possible.

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2021-08-02 19:44:04 +0200 (Mon, 02 Aug 2021)
Revision:18118
Build-Date:2021-08-02 18:26:20
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (18118 en) Windows 10 64-Bit
OS Build number: Windows 10 Home 2009 (19042)
Memory Usage: 1220 MB / 3568 MB (179 MB allocated, but free)
Java version: 11.0.10+9, AdoptOpenJDK, OpenJDK 64-Bit Server VM
Look and Feel: com.sun.java.swing.plaf.windows.WindowsLookAndFeel
Screen: \Display0 2560×1440 (scaling 1.00×1.00) \Display1 1920×1080 (scaling 1.00×1.00) \Display2 1200×1920 (scaling 1.00×1.00) \Display3 1680×1050 (scaling 1.00×1.00) \Display4 1680×1050 (scaling 1.00×1.00)
Maximum Screen Size: 2560×1920
Best cursor sizes: 16×16→32×32, 32×32→32×32
System property file.encoding: Cp1252
System property sun.jnu.encoding: Cp1252
Locale info: en_CA
Numbers with default locale: 1234567890 -> 1234567890
VM arguments: [-Dicedtea-web.bin.location=C:\Program Files\OpenWebStart\javaws, -Djava.util.Arrays.useLegacyMergeSort=true, --add-exports=jdk.deploy/com.sun.deploy.config=ALL-UNNAMED, --add-opens=java.desktop/javax.swing.text.html=ALL-UNNAMED, --add-reads=java.naming=ALL-UNNAMED,java.desktop, --add-exports=java.base/sun.security.action=ALL-UNNAMED,java.desktop, --add-reads=java.base=ALL-UNNAMED,java.desktop, --add-exports=java.naming/com.sun.jndi.toolkit.url=ALL-UNNAMED,java.desktop, --add-opens=java.base/jdk.internal.loader=ALL-UNNAMED, --add-exports=java.desktop/com.apple.eawt=ALL-UNNAMED, --add-exports=java.desktop/sun.awt=ALL-UNNAMED,java.desktop, --add-opens=java.base/jdk.internal.ref=ALL-UNNAMED, --add-exports=java.base/sun.security.validator=ALL-UNNAMED,java.desktop, --add-exports=java.desktop/com.sun.imageio.plugins.jpeg=ALL-UNNAMED, --add-exports=java.base/sun.net.www.protocol.jar=ALL-UNNAMED,java.desktop, --add-exports=java.base/jdk.internal.util.jar=ALL-UNNAMED,java.desktop, --add-opens=java.prefs/java.util.prefs=ALL-UNNAMED, --add-exports=java.base/com.sun.net.ssl.internal.ssl=ALL-UNNAMED,java.desktop, --add-exports=javafx.graphics/com.sun.javafx.application=ALL-UNNAMED, --add-modules=java.scripting,java.sql, --add-exports=java.desktop/sun.awt.X11=ALL-UNNAMED,java.desktop, --add-exports=java.desktop/sun.applet=ALL-UNNAMED,java.desktop,jdk.jsobject, --add-exports=java.base/sun.net.www.protocol.http=ALL-UNNAMED,java.desktop, --add-opens=java.base/java.lang=ALL-UNNAMED, --add-exports=java.base/sun.security.util=ALL-UNNAMED,java.desktop, --add-exports=java.desktop/com.sun.imageio.spi=ALL-UNNAMED, --add-reads=java.desktop=ALL-UNNAMED,java.naming, --add-opens=java.base/java.nio=ALL-UNNAMED, --add-exports=java.base/sun.security.x509=ALL-UNNAMED,java.desktop, --add-opens=java.desktop/javax.imageio.spi=ALL-UNNAMED, --add-exports=java.desktop/javax.jnlp=ALL-UNNAMED,java.desktop, --add-exports=java.base/sun.security.provider=ALL-UNNAMED,java.desktop]
Dataset consistency test: No problems found

Plugins:
+ PicLayer (1.0.1)
+ apache-commons (35524)
+ ejml (35458)
+ geotools (35458)
+ jaxb (35543)
+ jts (35458)
+ opendata (35640)
+ utilsplugin2 (35792)

Last errors/warnings:
- 00000.344 W: extended font config - overriding 'filename.Myanmar_Text=mmrtext.ttf' with 'MMRTEXT.TTF'
- 00000.346 W: extended font config - overriding 'filename.Mongolian_Baiti=monbaiti.ttf' with 'MONBAITI.TTF'
- 00005.960 W: Unable to request certificate of https://roottest-g3.pkioverheid.nl
- 00006.394 W: Unable to request certificate of https://roottest-g3.pkioverheid.nl
- 00128.063 E: Unsupported savable layer type: TMSLayer
- 09043.876 E: Unsupported savable layer type: ValidatorLayer
- 21217.782 E: Unsupported savable layer type: ValidatorLayer
- 26479.299 W: javax.net.ssl.SSLException: Connection reset. Cause: java.net.SocketException: Connection reset
- 26755.985 E: Unsupported savable layer type: TMSLayer

[Don-vip]

In 18175/josm:

fix #21225 - no warning if waterway ends with waterway=stream_end on final node