JIT: Why are ranche checks not optimized #135418

While working an an IBAN parser, I stumbled on char.IsBetween():

public static bool IsBetween(char c, char minInclusive, char maxInclusive)
  => (uint)(c - minInclusive) <= (uint)(maxInclusive - minInclusive);

As was writing code that also had to support .NET standard 2.0, I could not use the function itself, and wrote my own version (where the compiler even pre-calculated maxInclusive - minInclusive). So far so good. Then I thought, why not use inline range matching, as it easier to read, and the I assumed the JIT would optimize it this way anyway. But when I did, my benchmark became slower.

So I dove into the disassembly using the following:

using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Diagnosers;

[DisassemblyDiagnoser(printInstructionAddresses: true, syntax: DisassemblySyntax.Masm)]
public class Digit
{
	public uint n { get; set; } = '1';

	[Benchmark]
	public bool Pattern() => n is >= '0' and <= '9';

	[Benchmark]
	public bool Subtract() => n - '0' <= '9' - '0';
}

Which resulted in:

.NET 10.0.12 (10.0.12, 10.0.1226.42308), X64 RyuJIT x86-64-v3 (Job: DefaultJob)

; Digit.Pattern()
       7FF9F8DDA520 mov       eax,[rcx+8]
       7FF9F8DDA523 xor       ecx,ecx
       7FF9F8DDA525 cmp       eax,39
       7FF9F8DDA528 setbe     dl
       7FF9F8DDA52B movzx     edx,dl
       7FF9F8DDA52E cmp       eax,30
       7FF9F8DDA531 mov       eax,edx
       7FF9F8DDA533 cmovb     eax,ecx
       7FF9F8DDA536 ret
; Total bytes of code 23

.NET 10.0.12 (10.0.12, 10.0.1226.42308), X64 RyuJIT x86-64-v3 (Job: DefaultJob)

; Digit.Subtract()
       7FF9F8DEA4D0 mov       eax,[rcx+8]
       7FF9F8DEA4D3 add       eax,0FFFFFFD0
       7FF9F8DEA4D6 cmp       eax,9
       7FF9F8DEA4D9 setbe     al
       7FF9F8DEA4DC movzx     eax,al
       7FF9F8DEA4DF ret
; Total bytes of code 16

Why is this optimization not applied? Is in the general case not better? Is there something off with my code/setup why it is not done? Or this is this a welcomed improvement that could be added?