Time Trial lap times not saving to leaderboard

Platform: Linux (Steam/Proton)
Version: V1.6.9.3.3171.AVX
Track: Virginia International Raceway Full
Car: Porsche Cayman GT4
Time Trial lap times are registering in-session but not persisting to the leaderboard after saving and exiting.
Steps to reproduce:
1. Enter Time Trial — VIR Full, Porsche Cayman GT4
2. Complete clean laps — session records times correctly (Session Best, Personal Best, My Potential all display in HUD)
3. ESC to pause menu — session summary shows correct best lap (e.g. 1:55.680)
4. Select Retire — “Are you sure you want to save and quit this session?” dialog appears
5. Click OK
6. Return to Time Trial screen — PERSONAL BEST shows 0 / N/A. My time does not appear on the leaderboard.
The leaderboard is functional — other drivers’ times are visible. For example, filtering by Vehicle (Porsche Cayman) shows Tutel-Tobi at 1:58.220, but my faster time of 1:55.680 is not saved. The CLASS view also shows 8 drivers with times from 1:51.398 to 2:05.301 — none of them mine.
This started after the recent updates (1.6.9.x cycle). Times were saving normally before this update cycle.
Screenshots attached showing:
∙ In-session HUD with Session Best / Personal Best of 1:55.680
∙ Session pause screen confirming 1:55.680
∙ Save and quit dialog
∙ Leaderboard showing no personal best (0 / N/A)
∙ Vehicle-filtered leaderboard missing my time