diff --git a/scripts/bash/create-new-feature.sh b/scripts/bash/create-new-feature.sh
index 592dab2ea3..c40cfd77f0 100644
--- a/scripts/bash/create-new-feature.sh
+++ b/scripts/bash/create-new-feature.sh
@@ -128,32 +128,23 @@ get_highest_from_branches() {
 
 # Function to check existing branches (local and remote) and return next available number
 check_existing_branches() {
-    local short_name="$1"
-    local specs_dir="$2"
-    
+    local specs_dir="$1"
+
     # Fetch all remotes to get latest branch info (suppress errors if no remotes)
     git fetch --all --prune 2>/dev/null || true
-    
-    # Find all branches matching the pattern using git ls-remote (more reliable)
-    local remote_branches=$(git ls-remote --heads origin 2>/dev/null | grep -E "refs/heads/[0-9]+-${short_name}$" | sed 's/.*\/\([0-9]*\)-.*/\1/' | sort -n)
-    
-    # Also check local branches
-    local local_branches=$(git branch 2>/dev/null | grep -E "^[* ]*[0-9]+-${short_name}$" | sed 's/^[* ]*//' | sed 's/-.*//' | sort -n)
-    
-    # Check specs directory as well
-    local spec_dirs=""
-    if [ -d "$specs_dir" ]; then
-        spec_dirs=$(find "$specs_dir" -maxdepth 1 -type d -name "[0-9]*-${short_name}" 2>/dev/null | xargs -n1 basename 2>/dev/null | sed 's/-.*//' | sort -n)
+
+    # Get highest number from ALL branches (not just matching short name)
+    local highest_branch=$(get_highest_from_branches)
+
+    # Get highest number from ALL specs (not just matching short name)
+    local highest_spec=$(get_highest_from_specs "$specs_dir")
+
+    # Take the maximum of both
+    local max_num=$highest_branch
+    if [ "$highest_spec" -gt "$max_num" ]; then
+        max_num=$highest_spec
     fi
-    
-    # Combine all sources and get the highest number
-    local max_num=0
-    for num in $remote_branches $local_branches $spec_dirs; do
-        if [ "$num" -gt "$max_num" ]; then
-            max_num=$num
-        fi
-    done
-    
+
     # Return next number
     echo $((max_num + 1))
 }
@@ -247,7 +238,7 @@ fi
 if [ -z "$BRANCH_NUMBER" ]; then
     if [ "$HAS_GIT" = true ]; then
         # Check existing branches on remotes
-        BRANCH_NUMBER=$(check_existing_branches "$BRANCH_SUFFIX" "$SPECS_DIR")
+        BRANCH_NUMBER=$(check_existing_branches "$SPECS_DIR")
     else
         # Fall back to local directory check
         HIGHEST=$(get_highest_from_specs "$SPECS_DIR")
@@ -255,7 +246,8 @@ if [ -z "$BRANCH_NUMBER" ]; then
     fi
 fi
 
-FEATURE_NUM=$(printf "%03d" "$BRANCH_NUMBER")
+# Force base-10 interpretation to prevent octal conversion (e.g., 010 → 8 in octal, but should be 10 in decimal)
+FEATURE_NUM=$(printf "%03d" "$((10#$BRANCH_NUMBER))")
 BRANCH_NAME="${FEATURE_NUM}-${BRANCH_SUFFIX}"
 
 # GitHub enforces a 244-byte limit on branch names
diff --git a/scripts/powershell/create-new-feature.ps1 b/scripts/powershell/create-new-feature.ps1
index 351f4e9e7e..2f0172e35d 100644
--- a/scripts/powershell/create-new-feature.ps1
+++ b/scripts/powershell/create-new-feature.ps1
@@ -101,69 +101,25 @@ function Get-HighestNumberFromBranches {
 
 function Get-NextBranchNumber {
     param(
-        [string]$ShortName,
         [string]$SpecsDir
     )
-    
+
     # Fetch all remotes to get latest branch info (suppress errors if no remotes)
     try {
         git fetch --all --prune 2>$null | Out-Null
     } catch {
         # Ignore fetch errors
     }
-    
-    # Find remote branches matching the pattern using git ls-remote
-    $remoteBranches = @()
-    try {
-        $remoteRefs = git ls-remote --heads origin 2>$null
-        if ($remoteRefs) {
-            $remoteBranches = $remoteRefs | Where-Object { $_ -match "refs/heads/(\d+)-$([regex]::Escape($ShortName))$" } | ForEach-Object {
-                if ($_ -match "refs/heads/(\d+)-") {
-                    [int]$matches[1]
-                }
-            }
-        }
-    } catch {
-        # Ignore errors
-    }
-    
-    # Check local branches
-    $localBranches = @()
-    try {
-        $allBranches = git branch 2>$null
-        if ($allBranches) {
-            $localBranches = $allBranches | Where-Object { $_ -match "^\*?\s*(\d+)-$([regex]::Escape($ShortName))$" } | ForEach-Object {
-                if ($_ -match "(\d+)-") {
-                    [int]$matches[1]
-                }
-            }
-        }
-    } catch {
-        # Ignore errors
-    }
-    
-    # Check specs directory
-    $specDirs = @()
-    if (Test-Path $SpecsDir) {
-        try {
-            $specDirs = Get-ChildItem -Path $SpecsDir -Directory | Where-Object { $_.Name -match "^(\d+)-$([regex]::Escape($ShortName))$" } | ForEach-Object {
-                if ($_.Name -match "^(\d+)-") {
-                    [int]$matches[1]
-                }
-            }
-        } catch {
-            # Ignore errors
-        }
-    }
-    
-    # Combine all sources and get the highest number
-    $maxNum = 0
-    foreach ($num in ($remoteBranches + $localBranches + $specDirs)) {
-        if ($num -gt $maxNum) {
-            $maxNum = $num
-        }
-    }
-    
+
+    # Get highest number from ALL branches (not just matching short name)
+    $highestBranch = Get-HighestNumberFromBranches
+
+    # Get highest number from ALL specs (not just matching short name)
+    $highestSpec = Get-HighestNumberFromSpecs -SpecsDir $SpecsDir
+
+    # Take the maximum of both
+    $maxNum = [Math]::Max($highestBranch, $highestSpec)
+
     # Return next number
     return $maxNum + 1
 }
@@ -254,7 +210,7 @@ if ($ShortName) {
 if ($Number -eq 0) {
     if ($hasGit) {
         # Check existing branches on remotes
-        $Number = Get-NextBranchNumber -ShortName $branchSuffix -SpecsDir $specsDir
+        $Number = Get-NextBranchNumber -SpecsDir $specsDir
     } else {
         # Fall back to local directory check
         $Number = (Get-HighestNumberFromSpecs -SpecsDir $specsDir) + 1