Five days after moving N. truncata from peat/perlite/sand to sphagnum/perlite, the plant showed severe yellowing/browning on all but the newest leaf.
If the newest leaves and pitchers continue growing normally, the plant is fine. Nepenthes often shed older foliage rapidly after transplanting to focus energy on root re-establishment. Only worry if new growth also declines. Wait it out.
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