rust-lldb: Incorrectly display Option::None as Option::Some

I am developing a kernel, and when I tried debugging with rust-lldb, I found this:

pm1b = Some({gas:{address_space:SystemMemory, bit_width:'\x99', bit_offset:'\0', access_size:'\0', address:234201088}, handler:(), mapping:Some({physical_start:18446603338569718192, virtual_start:{pointer:"APIC\x99"}, region_length:18446603338569718160, mapped_length:18446603336455397376, handler:()})}) {
    0 = {
      gas = {
        address_space = SystemMemory
        bit_width = '\x99'
        bit_offset = '\0'
        access_size = '\0'
        address = 234201088
      }
      handler =
      mapping = Some({physical_start:18446603338569718192, virtual_start:{pointer:"APIC\x99"}, region_length:18446603338569718160, mapped_length:18446603336455397376, handler:()}) {
        0 = {
          physical_start = 18446603338569718192
          virtual_start = {
            pointer = 0xffff80000df5a000 "APIC\x99"
          }
          region_length = 18446603338569718160
          mapped_length = 18446603336455397376
          handler =
        }
      }
    }
  }

While I unwrapped pm1b with the following code:

let pm1 = &registers.pm1_control_registers;
log::debug!("pm1: {:?}", pm1.pm1b.is_some());
loop {
    let pm1b = pm1.pm1b.as_ref();
    pm1b.unwrap().write((slp_typa | (1 << 13)) as u64).unwrap();
}

And there's the output.

[DEBUG] pm1: false, kernel_hal/src/platform/bare/acpi/power.rs:20
[ERROR] Panic: panicked at kernel_hal/src/platform/bare/acpi/power.rs:23:14:
called `Option::unwrap()` on a `None` value

What made me sure that this is a bug of rust-lldb is the length of the region, which is too large to be valid.
And I am using 1.95.0-nightly (ce69df6f7 2026-02-12) toolchain, while the version of lldb is 21.1.8 from nixpkgs.

Start by reproducing the report with rust-lldb 21.1.8 and the nightly toolchain, using the Option value and code in kernel_hal/src/platform/bare/acpi/power.rs around lines 20 and 23. Compare the debugger's displayed value with the logged is_some() result and unwrap panic; done means the cause is identified and the debugger no longer presents None as Some.