Mass cane hates direct sun and wet feet. The "medicine" and night outdoors likely added sunburn and cold stress to existing root rot.
If you want immediate certainty, unpot and inspect roots. Firm, wiry roots = good chance. Black, mushy roots = likely lost.
With dry conditions and no sun, healthy roots will push new shoots.
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Sudden Leaf Drop on Dracaena marginata: Troubleshooting Light, Temperature, and Water
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