Reproduction steps:
1. Measure your Room Scale play area dimensions set in Quest (physically or in a third-party app like SteamVR)
2. Open the attached project "repro.zip"
3. Build & run SampleScene or enter Play Mode with Quest connected via Link
4. Notice Debug.Log values in the Console

Expected result: With an example playspace dimensions of 1m x 1m, the values from TryGetBoundaryPoints methods are returned as follows: (0.5, 0, 0.5); (0.5, 0, -0.5); (-0.5, 0, -0.5), (-0.5, 0, 0.5)
Actual result: The values from TryGetBoundaryPoints methods are returned as follows: (1, 0, 1); (1, 0, -1); (-1, 0, -1), (-1, 0, 1)

Reproducible with: 1.2.8 (2020.3.31f1), 1.3.1 (2020.3.31f1, 2021.2.16f1, 2022.1.0b12, 2022.2.0a9)
Could not test with: 2019.4.37f1 (OpenXR plugin is not available)

Notes:
The user has reported that this also reproduces with HTC Vive