diff --git a/src/mir/builder/control_flow/joinir/merge/instruction_rewriter.rs b/src/mir/builder/control_flow/joinir/merge/instruction_rewriter.rs
index 9840e531..9ad0c4c8 100644
--- a/src/mir/builder/control_flow/joinir/merge/instruction_rewriter.rs
+++ b/src/mir/builder/control_flow/joinir/merge/instruction_rewriter.rs
@@ -239,7 +239,8 @@ fn plan_rewrites(
     use super::block_remapper::remap_block_id;
 
     let trace = trace::trace();
-    let verbose = debug || crate::config::env::joinir_dev_enabled();
+    // Only verbose if explicitly requested via debug flag (not env var - causes test failures)
+    let verbose = debug;
     macro_rules! log {
         ($enabled:expr, $($arg:tt)*) => {
             trace.stderr_if(&format!($($arg)*), $enabled);
@@ -929,7 +930,8 @@ fn apply_rewrites(
     debug: bool,
 ) -> Result<(), String> {
     let trace = trace::trace();
-    let verbose = debug || crate::config::env::joinir_dev_enabled();
+    // Only verbose if explicitly requested via debug flag (not env var - causes test failures)
+    let verbose = debug;
     macro_rules! log {
         ($enabled:expr, $($arg:tt)*) => {
             trace.stderr_if(&format!($($arg)*), $enabled);
@@ -1100,7 +1102,8 @@ pub(super) fn merge_and_rewrite(
     // 3. apply_rewrites() - Mutate builder (apply changes)
 
     let trace = trace::trace();
-    let verbose = debug || crate::config::env::joinir_dev_enabled();
+    // Only verbose if explicitly requested via debug flag (not env var - causes test failures)
+    let verbose = debug;
     macro_rules! log {
         ($enabled:expr, $($arg:tt)*) => {
             trace.stderr_if(&format!($($arg)*), $enabled);