If a Samsung phone is restarted, the phone needs to be unlocked via typing the required pin. Also one might decide to unlock the phone by typing the pin without using the fingerprint reader. At any event, with Samsung phones, Jieshuo always requires the more cumbersome double-tap to type approach to input the pin. This is despite the fact that the lift-to-type typing approach works everywhere.
Technicallly speaking, it’s because of a wrong press prevention that works only on Samsung Keyboard because the app has the param. It’s been made for SIM pins, so users might not press numbers by mistake. Jieshuo uses it, which makes the lift-to-type aproach impossible, whereas TalkBack doesn’t.