The timer may be involved in enabling more than one cavity, or a shared supply event may have affected the appliance. The observation does not identify the clock as the failed part.
What the observation means
A hob that still works, particularly on a dual-fuel cooker, adds useful context but does not eliminate electrical questions. Record which functions were operating when the reset occurred.
A useful next step
Check only normal time and manual-mode settings after a known safe interruption. Repeated unexplained resets need assessment. Do not bypass the timer or repeatedly run both ovens to reproduce the event.
Manuals and supporting guidance
Model-specific instructions take priority. These references support the practical principles discussed here; they do not diagnose your appliance.