diff --git a/CMakeLists.txt b/CMakeLists.txt
index cd97a9ea8..5a9e91a5d 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -2251,8 +2251,10 @@ endforeach()
       NAME lavik_compact_collection_write_e2e
       COMMAND lavik_compact_collection_write_e2e_test $<TARGET_FILE:lavik>
     )
+    # The full write/recovery matrix can exceed ten minutes on ARM64 Debug
+    # runners; allow more time for the complete suite.
     set_tests_properties(lavik_compact_collection_write_e2e PROPERTIES
-      TIMEOUT 600 RUN_SERIAL TRUE
+      TIMEOUT 900 RUN_SERIAL TRUE
     )
 
     add_executable(lavik_adaptive_flush_e2e_test
diff --git a/bycorf b/bycorf
index 0f7b4c073..68095c7b3 160000
--- a/bycorf
+++ b/bycorf
@@ -1 +1 @@
-Subproject commit 0f7b4c0730d515422531528ecacb65457afdd939
+Subproject commit 68095c7b330c3c14efc43239b93feff22512f2e8
diff --git a/src/storage/engine/read.cpp b/src/storage/engine/read.cpp
index 53365b78c..6563ec672 100644
--- a/src/storage/engine/read.cpp
+++ b/src/storage/engine/read.cpp
@@ -63,11 +63,10 @@ class BatchReadAwaiter {
         --remaining_;
       }
     }
-    // A full io_uring SQ may submit and reap earlier operations while this
-    // loop is still preparing the batch. Unvisited operations are already in
-    // remaining_, so those completions cannot resume us early. The operation
-    // passed to each SubmitRead is itself guaranteed to complete
-    // asynchronously.
+    // Count the whole batch before submission and retire immediate rejections
+    // locally. Accepted operations remain outstanding while queued for backend
+    // capacity; each deferred completion retires one count, and only the last
+    // wakes the caller.
     return remaining_ != 0;
   }