I am uploading a NMU to DELAYED/10 in order to fix this.
The debdiff is attached.
diff -Nru ftpwatch-1.24/debian/changelog ftpwatch-1.24+nmu1/debian/changelog
--- ftpwatch-1.24/debian/changelog 2022-01-07 12:27:41.000000000 +0000
+++ ftpwatch-1.24+nmu1/debian/changelog 2024-06-27 20:56:23.000000000 +0000
@@ -1,3 +1,10 @@
+ftpwatch (1.24+nmu1) unstable; urgency=medium
+
+ * Non-maintainer upload
+ * Convert to source format 3.0 (closes: #1007640)
+
+ -- Bastian Germann <b...@debian.org> Thu, 27 Jun 2024 20:56:23 +0000
+
ftpwatch (1.24) unstable; urgency=medium
* Add build-arch and build-indep targets (closes: #998915)
diff -Nru ftpwatch-1.24/debian/source/format
ftpwatch-1.24+nmu1/debian/source/format
--- ftpwatch-1.24/debian/source/format 1970-01-01 00:00:00.000000000 +0000
+++ ftpwatch-1.24+nmu1/debian/source/format 2024-06-27 20:56:23.000000000
+0000
@@ -0,0 +1 @@
+3.0 (native)
