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Just wanted to let everyone know this should be fixed in 2019.2.2f1 (see changelog "Kernel: Fixed player crash due to stack overflow in Loading.PreloadManager thread (1162496, 1174959)"), but I didn't came around to confirm it for myself yet.

Dependent on what you do:

MissingMethodException: UnityEditor.VersionControl.Task UnityEditor.VersionControl.Provider.Checkout(string,UnityEditor.VersionControl.CheckoutMode)
Bolt.UnitBase.Update () (at C:/Users/lazlo/Projects/Bolt1/Package/Bolt.Flow/Editor/Options/UnitBase.cs:257)
Bolt.UnitOptionsWizard.UpdateUnitOptions () (at C:/Users/lazlo/Projects/Bolt1/Package/Bolt.Flow/Editor/Windows/UnitOptionsWizard.cs:51)
MissingMethodException: UnityEditor.VersionControl.Task UnityEditor.VersionControl.Provider.Checkout(string,UnityEditor.VersionControl.CheckoutMode)
Ludiq.SerializedPropertyProviderProvider.GenerateProviderScripts () (at C:/Users/lazlo/Projects/Bolt1/Package/Ludiq.Core/Editor/SerializedProperties/SerializedPropertyProviderProvider.cs:68)
Ludiq.GeneratePropertyProvidersPage.OnContentGUI () (at C:/Users/lazlo/Projects/Bolt1/Package/Ludiq.Core/Editor/Windows/GeneratePropertyProvidersWindow/GeneratePropertyProvidersPage.cs:38)
UnityEngine.Debug:LogException(Exception)
Ludiq.GeneratePropertyProvidersPage:OnContentGUI() (at C:/Users/lazlo/Projects/Bolt1/Package/Ludiq.Core/Editor/Windows/GeneratePropertyProvidersWindow/GeneratePropertyProvidersPage.cs:45)
Ludiq.Page:DrawContent() (at C:/Users/lazlo/Projects/Bolt1/Package/Ludiq.Core/Editor/Windows/Page.cs:70)
Ludiq.SinglePageWindow`1:OnGUI() (at C:/Users/lazlo/Projects/Bolt1/Package/Ludiq.Core/Editor/Windows/SinglePageWindow.cs:74)
Ludiq.WrappedEditorWindow:OnGUI() (at C:/Users/lazlo/Projects/Bolt1/Package/Ludiq.Core/Editor/Windows/WrappedEditorWindow.cs:51)
UnityEngine.GUIUtility:ProcessEvent(Int32, IntPtr)
MissingMethodException: UnityEditor.VersionControl.Task UnityEditor.VersionControl.Provider.Checkout(string,UnityEditor.VersionControl.CheckoutMode)
Bolt.UnitBase.Build () (at C:/Users/lazlo/Projects/Bolt1/Package/Bolt.Flow/Editor/Options/UnitBase.cs:174)
Bolt.TypeOptionsPage.Complete () (at C:/Users/lazlo/Projects/Bolt1/Package/Bolt.Flow/Editor/Windows/TypeOptionsPage.cs:94)
Bolt.TypeOptionsPage.OnContentGUI () (at C:/Users/lazlo/Projects/Bolt1/Package/Bolt.Flow/Editor/Windows/TypeOptionsPage.cs:81)
Ludiq.Page.DrawContent () (at C:/Users/lazlo/Projects/Bolt1/Package/Ludiq.Core/Editor/Windows/Page.cs:70)
Ludiq.Wizard.OnGUI () (at C:/Users/lazlo/Projects/Bolt1/Package/Ludiq.Core/Editor/Windows/Wizard.cs:106)
Ludiq.WrappedEditorWindow.OnGUI () (at C:/Users/lazlo/Projects/Bolt1/Package/Ludiq.Core/Editor/Windows/WrappedEditorWindow.cs:51)
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <7d97106330684add86d080ecf65bfe69>:0)
Rethrow as TargetInvocationException: Exception has been thrown by the target of an invocation.
System.Reflection.MonoMethod.Invoke (System.Object obj, System.Reflection.BindingFlags invokeAttr, System.Reflection.Binder binder, System.Object[] parameters, System.Globalization.CultureInfo culture) (at <7d97106330684add86d080ecf65bfe69>:0)
System.Reflection.MethodBase.Invoke (System.Object obj, System.Object[] parameters) (at <7d97106330684add86d080ecf65bfe69>:0)
UnityEditor.HostView.Invoke (System.String methodName, System.Object obj) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:340)
UnityEditor.HostView.Invoke (System.String methodName) (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:334)
UnityEditor.HostView.OldOnGUI () (at C:/buildslave/unity/build/Editor/Mono/HostView.cs:146)
UnityEngine.UIElements.IMGUIContainer.DoOnGUI (UnityEngine.Event evt, UnityEngine.Matrix4x4 parentTransform, UnityEngine.Rect clippingRect, System.Boolean isComputingLayout, UnityEngine.Rect layoutSize) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:295)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e, UnityEngine.Matrix4x4 worldTransform, UnityEngine.Rect clippingRect) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:481)
UnityEngine.UIElements.IMGUIContainer.HandleIMGUIEvent (UnityEngine.Event e) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:464)
UnityEngine.UIElements.IMGUIContainer.HandleEvent (UnityEngine.UIElements.EventBase evt) (at C:/buildslave/unity/build/Modules/UIElements/IMGUIContainer.cs:444)
UnityEngine.UIElements.MouseCaptureDispatchingStrategy.DispatchEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at C:/buildslave/unity/build/Modules/UIElements/Events/MouseCaptureDispatchingStrategy.cs:93)
UnityEngine.UIElements.EventDispatcher.ProcessEvent (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel) (at C:/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:280)
UnityEngine.UIElements.EventDispatcher.Dispatch (UnityEngine.UIElements.EventBase evt, UnityEngine.UIElements.IPanel panel, UnityEngine.UIElements.DispatchMode dispatchMode) (at C:/buildslave/unity/build/Modules/UIElements/EventDispatcher.cs:156)
UnityEngine.UIElements.BaseVisualElementPanel.SendEvent (UnityEngine.UIElements.EventBase e, UnityEngine.UIElements.DispatchMode dispatchMode) (at C:/buildslave/unity/build/Modules/UIElements/Panel.cs:189)
UnityEngine.UIElements.UIElementsUtility.DoDispatch (UnityEngine.UIElements.BaseVisualElementPanel panel) (at C:/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:255)
UnityEngine.UIElements.UIElementsUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at C:/buildslave/unity/build/Modules/UIElements/UIElementsUtility.cs:78)
UnityEngine.GUIUtility.ProcessEvent (System.Int32 instanceID, System.IntPtr nativeEventPtr) (at C:/buildslave/unity/build/Modules/IMGUI/GUIUtility.cs:179)

When adding types/generating unit options in 2019.1.14f1 (.net4 netstandard2) I'm now getting 

MissingMethodException: UnityEditor.VersionControl.Task UnityEditor.VersionControl.Provider.Checkout(string,UnityEditor.VersionControl.CheckoutMode)

after upgrading to the latest 1.4.6 (net4)