I'm was using Visual Studio 2019 to edit source code of mission planner (winforms) and after I move to 2026 and try to open any designers I see this errors

at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.EnsureDocument(IDesignerSerializationManager manager)
at System.ComponentModel.Design.Serialization.CodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager manager)
at Microsoft.VisualStudio.Design.Serialization.CodeDom.VSCodeDomDesignerLoader.PerformLoad(IDesignerSerializationManager serializationManager)
at System.ComponentModel.Design.Serialization.BasicDesignerLoader.BeginLoad(IDesignerLoaderHost host) 

I've already try to rebuild project, clean and build solution, build it on any cpu/x86, run repair of visual studio and delete .vs, obj and bin