[OnePlus 3 & 3T Cross Device Development] anijatsu:
The NFC doesn't work using build from 06-08-2019 on OnePlus 3T with newest Magisk.

I was able to retrieve some info from the system logs however, i.e.:

event.log:

07-09 20:40:17.664 I/auditd ( 453): avc: denied { find } for interface=vendor.nxp.nxpese::INxpEse sid=u:r:hal_nfc_default:s0 pid=555 scontext=u:r:hal_nfc_default:s0 tcontext=u:object_r:default_android_hwservice:s0 tclass=hwservice_manager permissive=0
07-09 20:40:17.666 I/auditd ( 453): avc: denied { find } for interface=vendor.nxp.nxpese::INxpEse sid=u:r:hal_nfc_default:s0 pid=555 scontext=u:r:hal_nfc_default:s0 tcontext=u:object_r:default_android_hwservice:s0 tclass=hwservice_manager permissive=0

dmesg.log:

[ 476.539220] type=1400 audit(1562696913.119:262): avc: denied { getattr } for pid=10386 comm="browser.classic" path="/data/nfc" dev="sda15" ino=2223873 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:object_r:nfc_data_file:s0 tclass=dir permissive=0 duplicate messages suppressed
[ 476.539260] type=1400 audit(1562696914.503:263): avc: denied { getattr } for pid=10386 comm="Thread-205" path="/data/nfc" dev="sda15" ino=2223873 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:object_r:nfc_data_file:s0 tclass=dir permissive=0
[ 476.543713] type=1400 audit(1562696914.503:264): avc: denied { getattr } for pid=10386 comm="Thread-205" path="/data/nfc" dev="sda15" ino=2223873 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:object_r:nfc_data_file:s0 tclass=dir permissive=0
[ 476.543748] type=1400 audit(1562696914.509:265): avc: denied { getattr } for pid=10386 comm="browser.classic" path="/data/nfc" dev="sda15" ino=2223873 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:object_r:nfc_data_file:s0 tclass=dir permissive=0
[ 476.952922] type=1400 audit(1562696914.509:265): avc: denied { getattr } for pid=10386 comm="browser.classic" path="/data/nfc" dev="sda15" ino=2223873 scontext=u:r:untrusted_app_25:s0:c512,c768 tcontext=u:object_r:nfc_data_file:s0 tclass=dir permissive=0

logcat.log:

07-09 20:40:17.662 E/libnfc_nci( 3092): [ERROR:gki_ulinux.cc(98)] gki_task task_id=0 terminating
07-09 20:40:17.663 D/NxpHal ( 555): nfc_debug_enabled : 0
07-09 20:40:17.664 E/SELinux ( 453): avc: denied { find } for interface=vendor.nxp.nxpese::INxpEse sid=u:r:hal_nfc_default:s0 pid=555 scontext=u:r:hal_nfc_default:s0 tcontext=u:object_r:default_android_hwservice:s0 tclass=hwservice_manager permissive=0
07-09 20:40:17.666 E/SELinux ( 453): avc: denied { find } for interface=vendor.nxp.nxpese::INxpEse sid=u:r:hal_nfc_default:s0 pid=555 scontext=u:r:hal_nfc_default:s0 tcontext=u:object_r:default_android_hwservice:s0 tclass=hwservice_manager permissive=0
07-09 20:40:17.699 I/libnfc_nci( 3092): [INFO:phNxpConfig.cpp(520)] find found NXPLOG_TML_LOGLEVEL=(0x3)
07-09 20:40:17.699 I/libnfc_nci( 3092):
07-09 20:40:17.699 I/libnfc_nci( 3092): [INFO:phNxpConfig.cpp(520)] find found NXPLOG_FWDNLD_LOGLEVEL=(0x3)
07-09 20:40:17.699 I/libnfc_nci( 3092):
07-09 20:40:17.699 I/libnfc_nci( 3092): [INFO:phNxpConfig.cpp(520)] find found NXPLOG_NCIX_LOGLEVEL=(0x3)
07-09 20:40:17.699 I/libnfc_nci( 3092):
07-09 20:40:17.699 I/libnfc_nci( 3092): [INFO:phNxpConfig.cpp(520)] find found NXPLOG_NCIR_LOGLEVEL=(0x3)
07-09 20:40:17.699 I/libnfc_nci( 3092):
07-09 20:40:17.699 E/libnfc_nci( 3092): [ERROR:NativeNfcManager.cpp(1097)] nfcManager_doInitialize: fail nfa enable; error=0x0
07-09 20:40:18.601 E/libnfc_nci( 3092): [ERROR:gki_ulinux.cc(666)] GKI TASK_DEAD received. exit thread 3...
07-09 20:40:18.601 E/libnfc_nci( 3092): [ERROR:gki_ulinux.cc(98)] gki_task task_id=3 terminating
07-09 20:40:18.701 I/com.android.nf( 3092): ConfigFile - Parsing file '/etc/libnfc-nci.conf'
07-09 20:40:18.701 I/com.android.nf( 3092): ConfigFile - [NFA_STORAGE] = "/data/nfc"
07-09 20:40:18.702 I/libnfc_nci( 3092): [INFO:NfcAdaptation.cc(460)] NfcAdaptation::InitializeHalDeviceContext: INfc::getService()
07-09 20:40:18.703 I/libnfc_nci( 3092): [INFO:NfcAdaptation.cc(466)] NfcAdaptation::InitializeHalDeviceContext: INfc::getService() returned 0x73c041c340 (remote)
07-09 20:40:18.706 E/libnfc_nci( 3092): [ERROR:gki_ulinux.cc(98)] gki_task task_id=4 terminating

Hope this helps in any way, otherwise I'm open for suggestions on what else could I check/provide.