Oh duh! I forgot that during his captivity in Dixing, when he's chained to the Pillar he can sense ZYL's energies in turmoil (while ZYL is in ZH's dream), and later in the Palace IIRC he's sensing ZYL coming to Dixing. So there's evidence of ZYL-sensing, but it's after the Dial exchange, so that explains the difference very neatly!
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Oh duh! I forgot that during his captivity in Dixing, when he's chained to the Pillar he can sense ZYL's energies in turmoil (while ZYL is in ZH's dream), and later in the Palace IIRC he's sensing ZYL coming to Dixing. So there's evidence of ZYL-sensing, but it's after the Dial exchange, so that explains the difference very neatly!