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DHCP Error after upgrading to 16.6.5 for Stacked 3850-24XS

Hello everybody,

 

We have 2 stacked 3850 as core switches and we recently upgraded to the latest recommended  image Everest (16.6.5) from and old one (3.7E). After the upgrade, the DHCP pool for NEC IP Phones stopped working, and the phones got stuck on searching for DHCP server. After running a debug  it seems that the DHCPOFFER sent by the switch is not recognized by the phones:

 

DHCP Pool:

ip dhcp pool nec
network 192.168.1.0 255.255.255.0
dns-server 192.168.2.1 192.168.2.2
default-router 192.168.1.1
option 42 ip 192.168.2.3
 option 66 ascii tftp://192.168.1.30/ 
 option 162 ip 192.168.1.30
 option 120 hex 010a.0f13.1e 

debug ip dhcp server events:

670092 2019-03-06T08:55:18.733912+02:00 gateway 913: 000909: Mar  6 08:55:18.728 EET: DHCPD: Sending notification of DISCOVER:
670093 2019-03-06T08:55:18.734033+02:00 gateway 914: 000910: Mar  6 08:55:18.728 EET:   DHCPD: htype 1 chaddr 0060.b9ee.12f5
670094 2019-03-06T08:55:18.734153+02:00 gateway 915: 000911: Mar  6 08:55:18.728 EET:   DHCPD: circuit id 000400630c04
670095 2019-03-06T08:55:18.734297+02:00 gateway 916: 000912: Mar  6 08:55:18.728 EET:   DHCPD: interface = Vlan99
670096 2019-03-06T08:55:18.734425+02:00 gateway 917: 000913: Mar  6 08:55:18.728 EET:   DHCPD: class id 4e4543534454373030
670097 2019-03-06T08:55:18.734545+02:00 gateway 918: 000914: Mar  6 08:55:18.729 EET: DHCPD: Sending notification of DISCOVER:
670098 2019-03-06T08:55:18.734681+02:00 gateway 919: 000915: Mar  6 08:55:18.729 EET:   DHCPD: htype 1 chaddr 0060.b9ee.12f5
670099 2019-03-06T08:55:18.734807+02:00 gateway 920: 000916: Mar  6 08:55:18.729 EET:   DHCPD: circuit id 000400630c04
670100 2019-03-06T08:55:18.734940+02:00 gateway 921: 000917: Mar  6 08:55:18.729 EET:   DHCPD: interface = Vlan99
670101 2019-03-06T08:55:18.735061+02:00 gateway 922: 000918: Mar  6 08:55:18.729 EET:   DHCPD: class id 4e4543534454373030
670102 2019-03-06T08:55:18.735181+02:00 gateway 923: 000919: Mar  6 08:55:18.729 EET: DHCPD: FSM state change INVALID
670103 2019-03-06T08:55:19.732276+02:00 gateway 924: 000920: Mar  6 08:55:18.729 EET: DHCPD: Workspace state changed from INIT to INVALID
670104 2019-03-06T08:55:19.732462+02:00 gateway 925: 000921: Mar  6 08:55:18.729 EET: DHCPD: Found previous server binding
670105 2019-03-06T08:55:19.732697+02:00 gateway 926: 000922: Mar  6 08:55:18.729 EET: DHCPD: Sending DHCPOFFER to client 0100.60b9.ee12.f5 (192.168.1.24).
670106 2019-03-06T08:55:22.012875+02:00 gateway 927: 000923: Mar  6 08:55:22.008 EET: DHCPD: Reload workspace interface Vlan99 tableid 0.

debug ip dhcp server packet:

673688 2019-03-06T10:15:55.360291+02:00 gateway 4164: 004157: Mar  6 10:15:55.303 EET: DHCPD: DHCPDISCOVER received from client 0100.60b9.ee12.f5 on interface Vlan99.
673689 2019-03-06T10:15:55.360411+02:00 gateway 4165: 004158: Mar  6 10:15:55.303 EET: Option 82 not presentDHCPD: Setting only requested parameters
673690 2019-03-06T10:15:55.360513+02:00 gateway 4166: 004159: Mar  6 10:15:55.303 EET: DHCPD: egress Interfce Vlan99
673691 2019-03-06T10:15:55.360626+02:00 gateway 4167: 004160: Mar  6 10:15:55.303 EET: DHCPD: broadcasting BOOTREPLY to client 0060.b9ee.12f5.
673692 2019-03-06T10:15:55.360734+02:00 gateway 4168: 004161: Mar  6 10:15:55.359 EET: Option 82 not present
673693 2019-03-06T10:15:56.359536+02:00 gateway 4169: 004162: Mar  6 10:15:55.359 EET: DHCPD: tableid for 192.168.1.1 on Vlan99 is 0

sh ip dhcp binding:

192.168.1.31     0100.1937.017f.ad       Infinite                Manual     Active     Vlan99
192.168.1.32     0100.1937.8161          Infinite                Manual     Active     Vlan99
192.168.1.53     0100.60b9.ee12.f5       Mar 06 2019 10:54 AM    Automatic  Selecting  Vlan99

Since there was no other configuration change, I am pretty certain that IOS upgrade caused the error. 

I am really skeptical for the following lines: 

FSM state change INVALID

Workspace state changed from INIT to INVALID

I would really appreciate any help/guidelines on the case. 

Thank you in advance 

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