================
@@ -19061,6 +19061,15 @@ void Sema::MarkFunctionReferenced(SourceLocation Loc, 
FunctionDecl *Func,
         }
       }
     });
+  } else if (NeedDefinition && getLangOpts().IncrementalExtensions &&
----------------
voyager-jhk wrote:

Hi @vgvassilev, you are right. Modifying `Sema` is the wrong layer.
I considered resetting the `InvalidDecl` flags inside 
`IncrementalParser::CleanUpPTU`. However, this still feels like a workaround, 
as it leaves orphaned template instantiations lingering in the AST. The proper 
fix seems to require a full transactional AST rollback?

https://github.com/llvm/llvm-project/pull/192588
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