Version Used:
.NET SDK:
Version: 6.0.100
Commit: 9e8b04bbff

Steps to Reproduce:

1. Create a record struct with a parameter list with at least two parameters:

public record struct S(char First, char Second)
{
}

2. Add a constructor that takes a parameter of some type (the exact type seems to not matter):

public record struct S(char First, char Second)
{
    public S(object o)
    {
    }
}

3. This produces CS8862: A constructor declared in a record with parameter list must have 'this' constructor initializer, which is expected. To fix this error, add a call to the default constructor:

public record struct S(char First, char Second)
{
    public S(object o) : this()
    {
    }
}

4. Attempt to create an instance of the struct:

var s = new S(new object());

Console.WriteLine(s);

Expected Behavior:
The struct is created and printed with First and Second set to default(char).

Actual Behavior:
A System.InvalidProgramException is thrown during execution:

Unhandled exception. System.InvalidProgramException: Common Language Runtime detected an invalid program. 
    at S..ctor(Object o)                                                                                                    
    at Program.<Main>$(String[] args) in D:\<path_ommited>\Program.cs:line 1

Full code:

Occurs both when running compiled to Debug and Release.

var s = new S(new object());

System.Console.WriteLine(s);

public record struct S(char First, char Second)
{
    public S(object o) : this()
    {
    }
}

https://dotnetfiddle.net/85o0Th