EVPN-MPLS T1 Label lost

[murrant]

Description

I'm attempting to use FRR as a route reflector for our EVPN/MPLS/ISIS-SR network.
It seems to be losing the label for type 1 circuits and sending 1048575 instead (binary 11111111111111111111).

Update received by FRR:

Update sent by FRR:

Version

FRRouting 9.1 (hv-reflector-vm) on Linux(5.15.0-97-generic).
Copyright 1996-2005 Kunihiro Ishiguro, et al.
configured with:
    '--build=x86_64-linux-gnu' '--prefix=/usr' '--includedir=${prefix}/include' '--mandir=${prefix}/share/man' '--infodir=${prefix}/share/info' '--sysconfdir=/etc' '--localstatedir=/var' '--disable-option-checking' '--disable-silent-rules' '--libdir=${prefix}/lib/x86_64-linux-gnu' '--libexecdir=${prefix}/lib/x86_64-linux-gnu' '--disable-maintainer-mode' '--localstatedir=/var/run/frr' '--sbindir=/usr/lib/frr' '--sysconfdir=/etc/frr' '--with-vtysh-pager=/usr/bin/pager' '--libdir=/usr/lib/x86_64-linux-gnu/frr' '--with-moduledir=/usr/lib/x86_64-linux-gnu/frr/modules' '--disable-dependency-tracking' '--enable-rpki' '--disable-scripting' '--enable-pim6d' '--with-libpam' '--enable-doc' '--enable-doc-html' '--enable-snmp' '--enable-fpm' '--disable-protobuf' '--disable-zeromq' '--enable-ospfapi' '--enable-bgp-vnc' '--enable-multipath=256' '--enable-user=frr' '--enable-group=frr' '--enable-vty-group=frrvty' '--enable-configfile-mask=0640' '--enable-logfile-mask=0640' 'build_alias=x86_64-linux-gnu' 'PYTHON=python3'

How to reproduce

Set up EVPN-MPLS VPWS circuit on equipment with BGP peering and confirm functionality.
Add FRR as route reflector and remove peering. The VPWS no long functions because the devices receive the wrong remote labels.

Expected behavior

Correct labels are sent.

Actual behavior

Labels are sent as 1048575

Additional context

Unclear if this is related to #7292
I have a packet capture with some moderately sensitive data (ASN) in it I can provide access to.

Checklist

• I have searched the open issues for this bug.
• I have not included sensitive information in this report.