Unclear "Role verification problem - Role 'route' is not in templates '///guidepost' (1)"

[mkoniecz]

What steps will reproduce the problem?

1. load ​https://www.openstreetmap.org/way/30730185
2. run validator

What is the expected result?

I get legible warning if any

What happens instead?

"Role verification problem - Role 'route' is not in templates '\/\/\/guidepost' (1)"

Is it complaining about "route" role? Maybe it should be empty? But why it mentions guidepost? ​https://www.openstreetmap.org/relation/2033747 has nothing guidepost related that I see.

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

Relative:URL: ^/trunk
Repository:UUID: 0c6e7542-c601-0410-84e7-c038aed88b3b
Last:Changed Date: 2020-06-12 19:48:35 +0200 (Fri, 12 Jun 2020)
Revision:16610
Build-Date:2020-06-13 01:30:48
URL:https://josm.openstreetmap.de/svn/trunk

Identification: JOSM/1.5 (16610 en_GB) Linux Ubuntu 19.10
Memory Usage: 800 MB / 976 MB (212 MB allocated, but free)
Java version: 11.0.7+10-post-Ubuntu-2ubuntu219.10, Ubuntu, OpenJDK 64-Bit Server VM
Look and Feel: javax.swing.plaf.metal.MetalLookAndFeel
Screen: :0.0 1920x1080 (scaling 1.0x1.0)
Maximum Screen Size: 1920x1080
Best cursor sizes: 16x16 -> 16x16, 32x32 -> 32x32
Java package: openjdk-11-jre:amd64-11.0.7+10-2ubuntu2~19.10
Java ATK Wrapper package: libatk-wrapper-java:all-0.35.0-3
libcommons-logging-java: libcommons-logging-java:all-1.2-2
fonts-noto: fonts-noto:-
Dataset consistency test: No problems found

Plugins:
+ buildings_tools (35474)
+ measurement (35405)
+ reverter (35487)

Last errors/warnings:
- W: java.net.SocketException: Unexpected end of file from server. Cause: java.net.SocketException: Unexpected end of file from server
- W: java.net.SocketException: Unexpected end of file from server. Cause: java.net.SocketException: Unexpected end of file from server
- W: java.net.SocketException: Unexpected end of file from server. Cause: java.net.SocketException: Unexpected end of file from server
- W: java.net.SocketException: Unexpected end of file from server. Cause: java.net.SocketException: Unexpected end of file from server
- W: java.net.SocketException: Unexpected end of file from server. Cause: java.net.SocketException: Unexpected end of file from server
- W: java.net.SocketException: Unexpected end of file from server. Cause: java.net.SocketException: Unexpected end of file from server
- W: java.net.SocketException: Unexpected end of file from server. Cause: java.net.SocketException: Unexpected end of file from server
- W: java.net.SocketException: Unexpected end of file from server. Cause: java.net.SocketException: Unexpected end of file from server
- W: java.net.SocketException: Unexpected end of file from server. Cause: java.net.SocketException: Unexpected end of file from server
- W: java.net.SocketException: Unexpected end of file from server. Cause: java.net.SocketException: Unexpected end of file from server