It is still could be and of the life for bulb, ballast and/or igniter.
I would investigate this ASAP (from my experience where water damage in the headlight unit “propagated” over weeks to other modules and indications of problem did change).
First step is to swap bulb, igniter, ballast and headlight control modules from left to right (using DIY for front bumper)…
Inspect all the modules connectors for water damage and wires inside headlight for the wires condition.
Computer will be needed to go further. Diller will test with the computer and most likely will suggest head light unit with new modules, LCM and some others replacement … VERY expensive.