Keep an ended link ended, and pin the drop a listener closes over

test/session-extras.test.ts

@@ -1486,6 +1486,9 @@ describe('LinkLife', () => {
 		link.end();
 
 		assert.match((await held).err?.message ?? '', /Session is closed/);
+		link.attach();
+		assert.equal(link.isAttached(), false, 'ended is final');
+		assert.equal(link.end(), false);
 	});
 });
 
@@ -2458,6 +2461,39 @@ describe('a peer that sends the next segment only once the last one is answered'
 		assert.deepEqual(await peerOf(smpp).close(), {}, 'a group nothing completed is not held');
 	});
 
+	test('reports a drop once as disconnected when a listener closes the session over the segments it lost', async t => {
+		const smpp = await startServer(t);
+		const { session } = await connect(t, smpp, { reconnect: { maxDelay: 100, minDelay: 20 } });
+
+		assert.ok(session);
+
+		const events: string[] = [];
+		const closed = once<true>(resolve => { session.on('close', () => { resolve(true); }); });
+
+		session.on('close', () => { events.push('close'); });
+		session.on('disconnected', () => { events.push('disconnected'); });
+		session.on('sessionError', () => { void session.close(); });
+
+		const [first] = segmentsOf(0x2D);
+
+		assert.ok(first);
+
+		const delivered = await peerOf(smpp).send({
+			cmdName: 'deliver_sm',
+			params: submitSmParams(
+				{ from: '46701113311', message: text, to: '46709771337' },
+				first,
+				{ encoding: 'ASCII', multipart: true },
+			),
+		});
+
+		assert.equal(delivered.err, undefined);
+		await peerOf(smpp).close();
+		await closed;
+
+		assert.deepEqual(events, ['disconnected', 'close']);
+	});
+
 	test('close() still waits for a concatenated message the application has not answered', async t => {
 		const smpp = await startServer(t, { shutdownTimeout: 50 });
 		const incoming = once<Sms>(resolve => {