Update from a recent trip out of and back into Beijing Daxing (PKX) airport ... Short version - abject failure ...!

Exiting at Daxing: No boarding pass scan needed (good) but the e-gate scanner failed to read my passport so had to use a manual lane.
Entry at Daxing: Scanner read the passport, but gave a "no registered fingerprints" message, so had to use a manual lane.

My wife (Chinese) was with me so convinced them to try and fix the fingerprint issue - I ended up re-registering for e-channel (at desk #24), but for some reason the system would not let them enter my fingerprints (only photo and thumbprint) - so likely to have the same problem next trip

I think the failure to read the passport is linked to the new UK passport design (similar to newly-issued passports in many countries now) where the chip is no longer in the passport cover, but is now embedded in a thick polycarbonate photo/details 'page'. Seems that higher RFID power is needed to power up the chip (even when I re-registered their machine could not read the chip and they had to enter all details manually ...).