Today I dug up my fig tree, and my suspicions were confirmed. Despite various efforts to loosen the soil, it’s very clayey there. As a result, a section of the trunk has rotted. I cut that part away, removed the fruit, trimmed the roots, and planted the fig tree trunk deeper into a 50-liter bucket. Now all I can do is hope. Keep your fingers crossed for me. I’ve put a screen over the insect-infested wood. Let’s see if that helps.