I have just tried and found:
Updated OmniOS 151046 with todays sealing patch
Resetted Windows 2019 AD server to a state prior deadline
Joined OmniOS to domain (napp-it menu Services > SMB > Active Directory)
everything ok (needed to wait a short time)
Reboot OmniOS
SMB access failed with log entry (napp-it menu System > Log)
Jun 21 13:39:38 omnios46 smbd[496]: [ID 122762 daemon.error] smb_domain_getinfo: no DC info
Jun 21 13:40:28 omnios46 smbd[496]: [ID 122762 daemon.error] smb_domain_getinfo: no DC info
Jun 21 13:42:08 omnios46 smbd[496]: [ID 892017 daemon.notice] smb_locate_dc timeout
Jun 21 13:42:08 omnios46 smbd[496]: [ID 199031 daemon.notice] smbd_dc_update: local.de: locate failed
Rejoin Domain
ok again
Updated OmniOS 151046 with todays sealing patch
Resetted Windows 2019 AD server to a state prior deadline
Joined OmniOS to domain (napp-it menu Services > SMB > Active Directory)
everything ok (needed to wait a short time)
Reboot OmniOS
SMB access failed with log entry (napp-it menu System > Log)
Jun 21 13:39:38 omnios46 smbd[496]: [ID 122762 daemon.error] smb_domain_getinfo: no DC info
Jun 21 13:40:28 omnios46 smbd[496]: [ID 122762 daemon.error] smb_domain_getinfo: no DC info
Jun 21 13:42:08 omnios46 smbd[496]: [ID 892017 daemon.notice] smb_locate_dc timeout
Jun 21 13:42:08 omnios46 smbd[496]: [ID 199031 daemon.notice] smbd_dc_update: local.de: locate failed
Rejoin Domain
ok again