diff --git a/MobileGL/MG_Backend/DirectVulkan/Renderer/FrameContext.cpp b/MobileGL/MG_Backend/DirectVulkan/Renderer/FrameContext.cpp
index 1d86aac1..d9eda7bd 100644
--- a/MobileGL/MG_Backend/DirectVulkan/Renderer/FrameContext.cpp
+++ b/MobileGL/MG_Backend/DirectVulkan/Renderer/FrameContext.cpp
@@ -7,6 +7,9 @@
 // End of Source File Header
 
 #include "FrameContext.h"
+#if MOBILEGL_BUILD_DISAGGREGATED
+#include <Config.h>
+#endif
 
 namespace MobileGL::MG_Backend::DirectVulkan {
     VkResult FrameContext::Initialize(VkDevice device, VkCommandPool commandPool, Uint32 frameCount) {
@@ -217,6 +220,13 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         VkImageMemoryBarrier presentBarrier{};
         presentBarrier.sType = VK_STRUCTURE_TYPE_IMAGE_MEMORY_BARRIER;
         presentBarrier.srcAccessMask = 0;
+#if MOBILEGL_BUILD_DISAGGREGATED
+        // A layout transition writes the image too. Order it after the wire
+        // render pass's storeOp, clears and copies instead of relying on the old
+        // per-draw queue-idle path. This applies even when contents are discarded.
+        if (MG_Config::Transport != MG_Config::TransportMode::Monolith)
+            presentBarrier.srcAccessMask = VK_ACCESS_MEMORY_WRITE_BIT;
+#endif
         presentBarrier.dstAccessMask = 0;
         presentBarrier.oldLayout = oldLayout;
         presentBarrier.newLayout = presentLayout;
@@ -228,7 +238,14 @@ namespace MobileGL::MG_Backend::DirectVulkan {
         presentBarrier.subresourceRange.levelCount = 1;
         presentBarrier.subresourceRange.baseArrayLayer = 0;
         presentBarrier.subresourceRange.layerCount = 1;
-        vkCmdPipelineBarrier(commandBuffer, VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT, VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT, 0, 0,
+        vkCmdPipelineBarrier(commandBuffer,
+#if MOBILEGL_BUILD_DISAGGREGATED
+                             MG_Config::Transport != MG_Config::TransportMode::Monolith
+                                 ? VK_PIPELINE_STAGE_ALL_COMMANDS_BIT : VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
+#else
+                             VK_PIPELINE_STAGE_TOP_OF_PIPE_BIT,
+#endif
+                             VK_PIPELINE_STAGE_BOTTOM_OF_PIPE_BIT, 0, 0,
                              nullptr, 0, nullptr, 1, &presentBarrier);
 
         if (openedRecording) {
diff --git a/MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.cpp b/MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.cpp
index cde67a8f..5228cf01 100644
--- a/MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.cpp
+++ b/MobileGL/MG_Backend/DirectVulkan/Renderer/ProgramFactory.cpp
@@ -3365,6 +3365,13 @@ namespace MobileGL::MG_Backend::DirectVulkan {
                                                 updateAfterBindSampledImages + updateAfterBindStorageImages;
         const auto& uab = m_updateAfterBindLimits;
         entry.usesUpdateAfterBind =
+#if MOBILEGL_BUILD_DISAGGREGATED
+            // Vulkan forbids ANY update-after-bind binding in a set layout that
+            // contains a dynamic buffer descriptor (VUID 03001/03011). Wire draws
+            // retain UniformManager's per-frame, content-versioned descriptor sets;
+            // this selects the legal ordinary pool, not in-place mutation of a live set.
+            (!program.IsWire() || entry.dynamicBindings.empty()) &&
+#endif
             uab.enabled && updateAfterBindSamplers <= uab.maxPerStageSamplers &&
             updateAfterBindUniformBuffers <= uab.maxPerStageUniformBuffers &&
             updateAfterBindStorageBuffers <= uab.maxPerStageStorageBuffers &&
diff --git a/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp b/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp
index 97c41e48..37c44260 100644
--- a/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp
+++ b/MobileGL/MG_Backend/DirectVulkan/Renderer/VulkanRenderer.cpp
@@ -7667,7 +7667,16 @@ void main() {
         VkMemoryBarrier memoryBarrier = BuildMemoryBarrierForGlBarriers(barriers);
 
         MGLOG_D("DirectVulkan: glMemoryBarrier(0x%x)", static_cast<Uint32>(barriers));
-        vkCmdPipelineBarrier(frame.commandBuffer, VK_PIPELINE_STAGE_ALL_COMMANDS_BIT,
+        vkCmdPipelineBarrier(frame.commandBuffer,
+#if MOBILEGL_BUILD_DISAGGREGATED
+                             // ALL_COMMANDS does not include HOST. The barrier's
+                             // HOST_WRITE access must have a matching source stage.
+                             MG_Config::Transport != MG_Config::TransportMode::Monolith
+                                 ? VK_PIPELINE_STAGE_ALL_COMMANDS_BIT | VK_PIPELINE_STAGE_HOST_BIT
+                                 : VK_PIPELINE_STAGE_ALL_COMMANDS_BIT,
+#else
+                             VK_PIPELINE_STAGE_ALL_COMMANDS_BIT,
+#endif
                              VK_PIPELINE_STAGE_ALL_COMMANDS_BIT, 0,
                              1, &memoryBarrier, 0, nullptr, 0, nullptr);
     }
@@ -14277,7 +14286,14 @@ void main() {
         descriptorIndexingFeatures.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_DESCRIPTOR_INDEXING_FEATURES;
         VkPhysicalDeviceDescriptorIndexingProperties descriptorIndexingProperties{};
         descriptorIndexingProperties.sType = VK_STRUCTURE_TYPE_PHYSICAL_DEVICE_DESCRIPTOR_INDEXING_PROPERTIES;
-        const Bool descriptorIndexingCore = m_physicalDevice.properties.apiVersion >= VK_API_VERSION_1_2;
+        const Bool descriptorIndexingCore =
+#if MOBILEGL_BUILD_DISAGGREGATED && !defined(VK_USE_PLATFORM_WIN32_KHR)
+            // CreateInstance requests Vulkan 1.1 on these platforms. A 1.2+ GPU
+            // does not promote descriptor indexing into that application's core
+            // API; the wire path must enable VK_EXT_descriptor_indexing instead.
+            (MG_Config::Transport == MG_Config::TransportMode::Monolith) &&
+#endif
+            m_physicalDevice.properties.apiVersion >= VK_API_VERSION_1_2;
         const Bool descriptorIndexingExtension =
             IsExtensionSupported(availableExtensions, VK_EXT_DESCRIPTOR_INDEXING_EXTENSION_NAME);
         auto getPhysicalDeviceProperties2 = reinterpret_cast<PFN_vkGetPhysicalDeviceProperties2>(