When using "is" with "and" in pattern matching, branch coverage is lower than normal

[Malivil]

Package: coverlet.msbuild
Version: 3.1.2
Format: opencover

Combining the C#7 is with the C#9 and in a pattern-matching if, branch coverage is lower than the same check in traditional boolean logic.

I created a simple repro of this because I cannot show the actual code that caused the problem (it's from my job).

is + and:

Traditional:

Repro code: https://github.com/Malivil/Coverlet1313Repro

[daveMueller]

Thanks for reporting this.

[github-actions]

This issue is stale because it has been open for 3 months with no activity.

[Malivil]

Stale, but still an issue

[github-actions]

This issue is stale because it has been open for 3 months with no activity.

[Malivil]

Stale, but still an issue

[Bertk]

@Malivil Please update repo.

• use target framework net6.0
• use latest preview from nightly build

[Malivil]

Done, no change