Windows.Forms.MonthCalendar control throws NullReferenceException

[coderesx]

Windows.Forms.MonthCalendar controls throws NullReferenceException when the user clicks to change the date

General

This is a new issue in .NET Core 3.1. It worked fine in .NET Core 3.0
Operating System is Windows 10 Pro.
This happens if the MinDate and MaxDate are set.

I attached a sample to reproduce the issue.

WindowsFormsCoreApp1.zip

I should have posted this to dotnet/winforms. Sorry about that.

[OliaG]

Thanks for reporting, we'll take a look! Cc @merriemcgaw @DustinCampbell

[RussKie]

@M-Lipin @vladimir-krestov could you have a look, it may be related to some work done recently