NetDB: LS not built for subsession

2.3.0-8 Started server tunnel with alt EdDSA destination.

DSA LS is built and visible in subdb tab, dest is green in sidebar.

EdDSA LS is apparently never built, dest is yellow in sidebar, no LS seen in either main or subdb LS tabs.

log on client side:

ERROR [er xxx] .i2ptunnel.I2PTunnelHTTPServer: Unable to connect subsession Session: xxxx[xxx (EdDSA) #1641(CLOSED)]: 
net.i2p.client.I2PSessionException: [xxx (EdDSA) #1641(OPENING)]: Cannot connect to the router on [internal connection]:0
	at net.i2p.client.impl.SubSession.connect(SubSession.java:141)
	at net.i2p.i2ptunnel.I2PTunnelServer.connectManager(I2PTunnelServer.java:361)
	at net.i2p.i2ptunnel.I2PTunnelServer.startRunning(I2PTunnelServer.java:433)
	at net.i2p.i2ptunnel.I2PTunnelHTTPServer.startRunning(I2PTunnelHTTPServer.java:218)
	at net.i2p.i2ptunnel.I2PTunnel.runHttpServer(I2PTunnel.java:770)
	at net.i2p.i2ptunnel.TunnelController.startHttpServer(TunnelController.java:691)
	at net.i2p.i2ptunnel.TunnelController.doStartTunnel(TunnelController.java:488)
	at net.i2p.i2ptunnel.TunnelController.startTunnel(TunnelController.java:429)
	at net.i2p.i2ptunnel.TunnelController$1.run(TunnelController.java:409)
	at java.base/java.lang.Thread.run(Thread.java:833)
	at net.i2p.util.I2PThread.run(I2PThread.java:103)
Caused by: java.io.IOException: No tunnels built after waiting 5 minutes. Your network connection may be down, or there is severe network congestion.
	at net.i2p.client.impl.SubSession.connect(SubSession.java:123)
	... 10 more

Router had been up for days and the DSA LS was built almost immediately. Have not investigated further. Looking for somebody else to reproduce.