Comment 2 for bug 1902343

The Ubuntu delta adds a 5 second sleep, which is still not present in Debian:
diff -Nru xmobar-0.33/debian/changelog xmobar-0.33/debian/changelog
--- xmobar-0.33/debian/changelog 2020-03-19 21:40:33.000000000 +0100
+++ xmobar-0.33/debian/changelog 2020-10-12 05:38:08.000000000 +0200
@@ -1,3 +1,15 @@
+xmobar (0.33-1ubuntu1) groovy; urgency=medium
+
+ * d/tests/xmobar: wait a little longer for X server to be ready.
+
+ -- Michael Hudson-Doyle <email address hidden> Mon, 12 Oct 2020 16:38:08 +1300
+
+xmobar (0.33-1build1) groovy; urgency=medium
+
+ * No-change rebuild against libffi8ubuntu1
+
+ -- Steve Langasek <email address hidden> Thu, 27 Aug 2020 00:15:49 +0000
+
 xmobar (0.33-1) unstable; urgency=medium

   * New upstream version
diff -Nru xmobar-0.33/debian/control xmobar-0.33/debian/control
--- xmobar-0.33/debian/control 2020-03-19 21:39:52.000000000 +0100
+++ xmobar-0.33/debian/control 2020-08-27 02:15:49.000000000 +0200
@@ -1,7 +1,8 @@
 Source: xmobar
 Section: x11
 Priority: optional
-Maintainer: Apollon Oikonomopoulos <email address hidden>
+Maintainer: Ubuntu Developers <email address hidden>
+XSBC-Original-Maintainer: Apollon Oikonomopoulos <email address hidden>
 Uploaders: Aggelos Avgerinos <email address hidden>,
 Standards-Version: 4.5.0
 Build-Depends: debhelper-compat (=12),
diff -Nru xmobar-0.33/debian/tests/xmobar xmobar-0.33/debian/tests/xmobar
--- xmobar-0.33/debian/tests/xmobar 2019-01-14 21:27:04.000000000 +0100
+++ xmobar-0.33/debian/tests/xmobar 2020-10-12 05:25:23.000000000 +0200
@@ -15,6 +15,8 @@
 done
 echo

+sleep 5
+
 xmobar /usr/share/doc/xmobar/examples/xmobar.config &
 xmobar_pid=$!

As I see without the test the arm64 autopkgtest was constantly failing:

https://autopkgtest.ubuntu.com/packages/x/xmobar/groovy/arm64

Have you verified that the autopkgtest passes now on arm64?