Dark, shriveled leaves and yellowing/drop are not typical of fungus. They point to physical damage (temperature extremes, chemical exposure) or root rot from overwatering.
Moss covering the soil surface prevents you from judging moisture and slows drying. Remove it immediately.
Mature jades (Crassula ovata) rarely need repotting. Disturbing roots often worsens the problem. If you dislike the plastic pot, slip it into a decorative cachepot.
After moss removal, you'll better gauge soil dryness. New growth should be firm and glossy. If rot is advanced, take healthy stem cuttings (let callus 2 days, root in gritty mix) as insurance.
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