diff --git a/core/libs/prx/libSceHmd2/Export.cpp b/core/libs/prx/libSceHmd2/Export.cpp
index a6ca6f3ad..9f1c4cb8f 100644
--- a/core/libs/prx/libSceHmd2/Export.cpp
+++ b/core/libs/prx/libSceHmd2/Export.cpp
@@ -11,6 +11,11 @@ constexpr std::int32_t SCE_HMD2_ERROR_UNSUPPORTED_FEATURE = static_cast<std::int
 
 extern "C" {
 
+int APS5_VABI sceHmd2ReprojectionQuerySeeThroughBufferSizeAlign() {
+    NotImplemented_nid_no_patch(__func__);
+    return 0;
+}
+
 std::int32_t APS5_VABI sceHmd2Initialize(const void* param) {
     (void)param;
     return SCE_HMD2_ERROR_UNSUPPORTED_FEATURE;
diff --git a/core/libs/prx/libSceVideoOut/Unimplemented.cpp b/core/libs/prx/libSceVideoOut/Unimplemented.cpp
index ddeb807c6..0c946149c 100644
--- a/core/libs/prx/libSceVideoOut/Unimplemented.cpp
+++ b/core/libs/prx/libSceVideoOut/Unimplemented.cpp
@@ -7,6 +7,16 @@
 
 extern "C" {
 
+int APS5_VABI sceVideoOutSetFlipMaster() {
+    NotImplemented_nid_no_patch(__func__);
+    return 0;
+}
+
+int APS5_VABI sceVideoOutClearFlipMaster() {
+    NotImplemented_nid_no_patch(__func__);
+    return 0;
+}
+
 int APS5_VABI sceVideoOutGetOutputStatusWithVrr(int handle, void* status) {
     NotImplemented_nid_no_patch(__func__);
     return 0;
diff --git a/docs/dev/debt/libSceHmd2.md b/docs/dev/debt/libSceHmd2.md
index 64d7e9b47..aab10875a 100644
--- a/docs/dev/debt/libSceHmd2.md
+++ b/docs/dev/debt/libSceHmd2.md
@@ -6,6 +6,7 @@
 
 ### Unknown function info
 
+- PPSA29866 imports declared without parameters, signatures unknown, added without an implementation because the title fails to load without them: [sceHmd2ReprojectionQuerySeeThroughBufferSizeAlign](../../../core/libs/prx/libSceHmd2/Export.cpp) (libSceHmd2), [sceVideoOutSetFlipMaster and sceVideoOutClearFlipMaster](../../../core/libs/prx/libSceVideoOut/Unimplemented.cpp) (libSceVideoOut)
 - [sceHmd2Initialize](../../../core/libs/prx/libSceHmd2/Export.cpp) (libSceHmd2) - the error the console returns when the PS VR2 runtime is unavailable is unknown; it returns libSceHmd's `UNSUPPORTED_FEATURE` (0x81110016). PPSA01317 passes a pointer to 16 zeroed bytes and only tests the result for non-zero
 - PPSA01317 imports declared without parameters, signatures unknown: the remaining [libSceHmd2](../../../core/libs/prx/libSceHmd2/Export.cpp) and [libSceVrTracker2](../../../core/libs/prx/libSceVrTracker2/Export.cpp) exports. Names from the aerolib NID list
 - PPSA15878 imports declared without parameters, signatures unknown: the [libSceHmd2](../../../core/libs/prx/libSceHmd2/Export.cpp) reprojection and gaze exports, `sceVrTracker2Finalize`, `sceVrTracker2GetPlayAreaOrientedBoundingBox` and `sceVrTracker2LocateCoordinateSystem` in [libSceVrTracker2](../../../core/libs/prx/libSceVrTracker2/Export.cpp), and the `scePadVrController` trigger effect exports in [libScePad](../../../core/libs/prx/libScePad/Export.cpp). Names from the aerolib NID list