Repro steps:
1. Create a new project with the URP template
2. Add XR Plug-in Management and check 'Oculus' in the window
3. Open the Profiler Window and make sure that recording is on
4. Enter Play Mode and observe the errors in the Console
5. Turn off recording in the Profiler Window
6. Enter Play Mode and observe no errors

Expected: No errors appear in the Console when Profiler recording is on
Actual: Console is spammed with "Missing Profiler.EndSample" errors

Reproducible with: 2020.2.6f1 (URP 10.3.1), 2021.1.0b8 (URP 11.0.0), 2021.2.0a6 (URP 12.0.0)
Not reproducible with: 2019.4.21f1 (URP 7.5.3), 2020.1.17f1 (URP 8.3.1)

Notes:
- If it doesn't reproduce try docking the Profiler Window so that it's always visible
- Try checking 'Oculus' specifically in the XR Plug-in Management Window's Standalone tab
- Might not reproduce while build target is set to Android