diff --git a/src/formatter.lua b/src/formatter.lua
index 77cde74..78bc3fb 100644
--- a/src/formatter.lua
+++ b/src/formatter.lua
@@ -98,9 +98,12 @@ function M.format_document(content, options)
   local indent_char = use_spaces and string.rep(" ", indent_size) or "\t"
   
   -- Attribute block collapsing options
+  -- NOTE: Disabled by default to preserve compatibility with attr_toggle.
+  -- When formatter collapses blocks, the original content is lost.
+  -- Use :SCLCollapseAllAttrBlocks after formatting instead.
   local collapse_attributes = options.collapseAttributes
   if collapse_attributes == nil then
-    collapse_attributes = true  -- Default: enabled
+    collapse_attributes = false  -- Default: disabled to preserve toggle functionality
   end
   
   -- User can provide custom patterns or extend defaults
@@ -531,7 +534,9 @@ function M.get_formatting_options()
     trimTrailingWhitespace = true,
     insertFinalNewline = true,
     trimFinalNewlines = true,
-    collapseAttributes = true,  -- Collapse variable attribute blocks to {...}
+    collapseAttributes = false,  -- Disabled by default to preserve toggle functionality
+    -- Set to true to enable automatic collapsing during formatting:
+    -- collapseAttributes = true,
     -- collapsePatterns = { ... },  -- Override default collapse patterns
     -- extendCollapsePatterns = { ... },  -- Extend default patterns with custom ones
     -- collapseVariableRules = {  -- Per-variable collapse rules (highest priority)