"CS7038: Failed to emit module" when using List Pattern Matching on custom type

[JaThePlayer]

Version Used: c#11 preview, Visual Studio 2022 17.1.1, though it also happens on SharpLab.
Steps to Reproduce:

• Create a new class or struct, and implement the this[Index i] function, but don't add a Count or Length property.
• Try to use List Pattern Matching on an instance of that class/struct

I've created a SharpLab example that suffers from this issue, though it also happens locally in Visual Studio.

Expected Behavior:
A helpful error message.
Actual Behavior:
The compiler issues an unhelpful error:
Error CS7038 Failed to emit module '_': Unable to determine specific cause of the failure.

[RikkiGibson]

Duplicate of #59465

[RikkiGibson]

Thank you for filing this issue. The fix for this should be available when VS 17.2 preview 2 comes out.