foreach will jump to other code in dotnet9

[Coloryr]

Description

When I upgrade the project to Dotnet9 and foreach the list, I will jump to other code by myself after the list is not fully foreach.
dotnet8
https://github.com/user-attachments/assets/5bd3c4cb-2c7f-4b53-ae2f-adc318f6ee80

dotnet9
https://github.com/user-attachments/assets/9ddfc90d-0000-4bc7-a177-d962416d2d83

Reproduction Steps

1. make a List
2. add some thing
3. foreach it

Expected behavior

foreach every item

Actual behavior

foreach some item and exit all code

Regression?

dotnet9

Known Workarounds

No response

Configuration

windows x64

Other information

No response

[am11]

I have seen this (and stuff like debugger is stepping through both if and else in single iteration) happening in unclean state. I'd close all VS instances, kill -name dotnet in powershell and delete bin and obj directories before retrying.

[hoyosjs]

cc: @dotnet/dotnet-diag

@mikelle-rogers - you might be the most familiar with this codepath right now in case you have cycles.

@Coloryr - are there any repros for this?

@tommcdon might be a manifestation of #109785. It's async stepping becomes a go and ends up in the next bp set by the user.

[Coloryr]

Yes, it will skip most of the code.

[Coloryr]

I have seen this (and stuff like debugger is stepping through both if and else in single iteration) happening in unclean state. I'd close all VS instances, kill -name dotnet in powershell and delete bin and obj directories before retrying.

Clean everything did't work.

[tommcdon]

Reactivated for backport to 9.0

[tommcdon]

Fixed via #110533