OnePlus Nord CE 5G (EB2103) 3.5mm headset input is silence with mmap enabled

Android version(s): 11
Android device(s): OnePlus Nord CE 5G (EB2103)
Oboe version: 1.6.1
App name used for testing: OboeTester (Record and Play)

**Short description**
Input is silence when using 3.5mm headset mic with mmap enabled

**Steps to reproduce**
Navigate to Record and Play within the OboeTester. Record with defaults (AAudio/mmap/exclusive), stop and play.

**Expected behavior**
Audio is picked up by headset mic.

**Actual behavior**
Recording is silence.

**Device**

ro.product.brand = OnePlus
ro.product.manufacturer = OnePlus
ro.product.model = EB2103
ro.product.device = OnePlusNordCE
ro.product.cpu.abi = arm64-v8a
ro.build.description = OnePlusNordCE-user 11 release-keys
ro.hardware = qcom
ro.hardware.chipname =
ro.arch =
| grep aaudio = [aaudio.hw_burst_min_usec]: [2000]
[aaudio.mmap_exclusive_policy]: [2]
[aaudio.mmap_policy]: [2]

**Any additional context**

The issue does not reproduce with the device built-in mic, with Open SL, or with mmap disabled. I have the device in hand so I will be happy to run any further tests or provide any more information that might be helpful. Thank you!