diff --git a/src/test/data/script_tests.json b/src/test/data/script_tests.json
--- a/src/test/data/script_tests.json
+++ b/src/test/data/script_tests.json
@@ -3218,6 +3218,20 @@
     "BITFIELD_SIZE",
     "CHECKMULTISIG 2-of-8 Schnorr, wrong way to represent 0b10000001"
 ],
+[
+    "0x01 0x20 0x41 0xa07b665bb4c5385afb0b0369ee675c5e890c9b9b63962aea5d9fcaeb0fc427e1c13b76baff5bedcf90f61070b3c62b976ffeaf4c6701ee37ae764a1e171b8afc01",
+    "1 -1 -1 -1 -1 -1 0x21 0x0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798 -1 7 CHECKMULTISIG",
+    "MINIMALDATA,NULLFAIL,SCHNORR_MULTISIG,STRICTENC",
+    "OK",
+    "CHECKMULTISIG 1-of-7 Schnorr, second-to-last key"
+],
+[
+    "0x02 0x0004 0x41 0x9d831f1ffb45eb4578098e9df80374e4c9172aa99fe3d7bb226feafa5ba280ed2e02834aeef31ee91d12e84afb2701ae6f88821be008741b2c689a779ff3276101",
+    "1 -1 -1 -1 -1 -1 -1 -1 -1 -1 -1 0x21 0x0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798 -1 -1 13 CHECKMULTISIG",
+    "MINIMALDATA,NULLFAIL,SCHNORR_MULTISIG,STRICTENC",
+    "OK",
+    "CHECKMULTISIG 1-of-13 Schnorr, third-to-last key"
+],
 [
     "0x03 0xffff0f 0x41 0x5f4f7ffff1fa44347dbc148d51fe661b60fbc44b5abe22a04d97ecfb891bdb2568eb91aa38a426dfd7b82e0b45b57af6f3e56143fabc850ebfdfcf6a0d03c4b001 0x41 0x28add881f6fa489a9016f066022ed80acecbafc351a6d17025cf87bf2b0d9b09f6d001f5df2b1be0d1909a8fe9280b59b5a8cb6d1e37425e733ff3267ce1e1b401 0x41 0x9f66f20bca4a64fc3cc170c3e1ef2bcb62f86b719b2f8e7154407e9210fde99164d754f787bf65020dc7db3838c8aae3591eaf465f45433fcb3d0a94bea4090401",
     "OVER DUP DUP 2DUP 3DUP 3DUP 3DUP 3DUP 0x01 0x14 0x21 0x0279be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798 0x21 0x038282263212c609d9ea2a6e3e172de238d8c39cabd5ac1ca10646e23fd5f51508 0x21 0x03363d90d447b00c9c99ceac05b6262ee053441c7e55552ffe526bad8f83ff4640 OVER DUP DUP 2DUP 3DUP 3DUP 3DUP 3DUP 0x01 0x14 CHECKMULTISIG",
diff --git a/src/test/script_tests.cpp b/src/test/script_tests.cpp
--- a/src/test/script_tests.cpp
+++ b/src/test/script_tests.cpp
@@ -36,7 +36,7 @@
 #include <vector>
 
 // Uncomment if you want to output updated JSON tests.
-#define UPDATE_JSON_TESTS
+// #define UPDATE_JSON_TESTS
 
 static const uint32_t gFlags = SCRIPT_VERIFY_P2SH | SCRIPT_VERIFY_STRICTENC;
 
@@ -2042,6 +2042,22 @@
             .PushSigSchnorr(keys.key0)
             .PushSigSchnorr(keys.key2)
             .SetScriptError(ScriptError::INVALID_BITFIELD_SIZE));
+    tests.push_back(
+        TestBuilder(CScript() << OP_1 << -1 << -1 << -1 << -1 << -1
+                              << ToByteVector(keys.pubkey0C) << -1 << 7
+                              << OP_CHECKMULTISIG,
+                    "CHECKMULTISIG 1-of-7 Schnorr, second-to-last key",
+                    newmultisigflags)
+            .Push("20")
+            .PushSigSchnorr(keys.key0));
+    tests.push_back(
+        TestBuilder(CScript() << OP_1 << -1 << -1 << -1 << -1 << -1 << -1 << -1
+                              << -1 << -1 << -1 << ToByteVector(keys.pubkey0C)
+                              << -1 << -1 << 13 << OP_CHECKMULTISIG,
+                    "CHECKMULTISIG 1-of-13 Schnorr, third-to-last key",
+                    newmultisigflags)
+            .Push("0004")
+            .PushSigSchnorr(keys.key0));
     tests.push_back(
         TestBuilder(CScript()
                         << OP_OVER << OP_DUP << OP_DUP << OP_2DUP << OP_3DUP