Preview load to determine if class is production no longer overwrites class

CHANGELOG.md

@@ -19,6 +19,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Fix Revert not syncing files with IRIS (#789)
 - Fix "Export All" stopping prematurely because a tracked item no longer exist in the namespace (#821)
 - Import All now outputs a warning instead of an error when an item is in the wrong path (#291)
+- Fixed an error where classes with compilation errors would revert to broken versions on export (#830)
 
 
 ## [2.12.2] - 2025-07-08

cls/SourceControl/Git/Production.cls

@@ -386,16 +386,16 @@ ClassMethod IsProductionClass(className As %String, nameMethod As %String) As %B
 		set filename = $classmethod(##class(%Studio.SourceControl.Interface).SourceControlClassGet(), nameMethod, className_".CLS")
 		if ##class(%File).Exists(filename) && '##class(%File).DirectoryExists(filename) && (##class(%File).GetFileSize(filename) '= 0) {
 			try {
-				set ^||%oddDEF=1
+				set ^||%oddDEF(className) = ""
 				$$$ThrowOnError($system.OBJ.Load(filename, "-d"))
 				// class XDatas are stored in ^||%oddDEF("<class name>","x","<XData name>") after temp load
 				set hasProdDef = $data(^||%oddDEF(className,$$$cCLASSxdata,"ProductionDefinition"))
-				kill ^||%oddDEF
+				kill ^||%oddDEF(className)
 				if hasProdDef {
 					return 1
 				}
 			} catch err {
-				kill ^||%oddDEF
+				kill ^||%oddDEF(className)
 				throw err
 			}
 		}