[MX] VLANTaggedFrames counter shows 0 on 1G interface of MIC-3D-20GE-SFP

The MIC-3D-20GE-SFP hardware VLAN frames counter is always 0.

When 1 GE interface of MIC MIC-3D-20GE-SFP is used with the following configuration, "show interface < > extensive" of the respective MIC-3D-20GE-SFP doesn't show any "VLAN tagged frames" under "MAC statistics". However, when 10 GE interface of MIC "MIC-3D-4XGE-XFP" or "MIC-3D-2XGE-XFP" is used, the output of "show interface < > extensive" will show ""VLAN tagged frames" under "MAC statistics", and they are incrementing properly.

lab# show
 vlan-tagging;
 unit 0 {
     vlan-id 100;
     family inet {
         address 100.100.100.1/24;
     }
 }

Example output:

lab@mx480-2-re0# run show interfaces xe-5/2/0 extensive | match vlaVLAN tagged frames 7991 <<<<<<< VLAN-Tag [ 0x8100.2500 ] In(pop) Out(push 0x8100.2500) Encapsulation: VLAN-VPLS Flags: SNMP-Traps 0x4004000 VLAN-Tag [ 0x0000.0 ] Encapsulation: ENET2 lab@mx480-2-re0# run show interface ge-0/0/1 extensive | match vla VLAN tagged frames 0 <<<<<<<<< Flags: SNMP-Traps 0x4000 VLAN-Tag [ 0x8100.100 ] Encapsulation: ENET2 Flags: SNMP-Traps 0x4004000 VLAN-Tag [ 0x0000.0 ] Encapsulation: ENET2 lab@mx480-2-re0# run show chassis hardware Hardware inventory: Item Version Part number Serial number Description Chassis JN119C5A3AFB MX480 Midplane REV 05 710-017414 ACAA7551 MX480 Midplane FPM Board REV 02 710-017254 YS2158 Front Panel Display PEM 0 Rev 06 740-029970 QCS1049U028 PS 1.4-2.52kW; 90-264V AC in PEM 1 Rev 06 740-029970 QCS1049U017 PS 1.4-2.52kW; 90-264V AC in PEM 2 Rev 06 740-029970 QCS1049U00P PS 1.4-2.52kW; 90-264V AC in PEM 3 Rev 06 740-029970 QCS1049U01H PS 1.4-2.52kW; 90-264V AC in Routing Engine 0 REV 15 740-013063 9012011286 RE-S-2000 Routing Engine 1 REV 15 740-013063 9012011291 RE-S-2000 CB 0 REV 09 710-021523 YY8430 MX SCB CB 1 REV 09 710-021523 YY8274 MX SCB FPC 0 REV 16 750-031089 YM8052 MPC Type 2 3D CPU REV 06 711-030884 YM8454 MPC PMB 2G MIC 0 REV 22 750-028392 YN1447 3D 20x 1GE(LAN) SFP <<<<<<<<< PIC 0 BUILTIN BUILTIN 10x 1GE(LAN) SFP Xcvr 1 REV 01 740-011782 PBB1D40 SFP-SX PIC 1 BUILTIN BUILTIN 10x 1GE(LAN) SFP Xcvr 0 REV 01 740-013111 7271648 SFP-T MIC 1 REV 24 750-028387 YJ3861 3D 4x 10GE XFP PIC 2 BUILTIN BUILTIN 2x 10GE XFP Xcvr 0 REV 01 740-014279 853019B00322 XFP-10G-LR PIC 3 BUILTIN BUILTIN 2x 10GE XFP Xcvr 0 REV 03 740-014289 CA37BQ0B8 XFP-10G-SR FPC 1 REV 29 750-031090 YW0004 MPC Type 2 3D EQ CPU REV 06 711-030884 YW3531 MPC PMB 2G QXM 0 REV 05 711-028408 YV9307 MPC QXM QXM 1 REV 05 711-028408 YV9328 MPC QXM FPC 2 REV 05 750-024064 XD6394 MS-DPC CPU REV 07 710-013713 XC3852 DPC PMB PIC 0 BUILTIN BUILTIN MS-DPC PIC PIC 1 BUILTIN BUILTIN MS-DPC PIC FPC 4 REV 35 750-016670 YR9645 DPCE 40x 1GE R EQ CPU REV 08 710-013713 YR0396 DPC PMB PIC 0 BUILTIN BUILTIN 10x 1GE(LAN) EQ Xcvr 0 REV 01 740-013111 8245861 SFP-T Xcvr 1 REV 02 740-013111 A492672 SFP-T Xcvr 5 REV 02 740-011613 PHE25LY SFP-SX Xcvr 6 REV 01 740-011613 PCE04LG SFP-SX PIC 1 BUILTIN BUILTIN 10x 1GE(LAN) EQ Xcvr 0 REV 01 740-011613 PBN0CEA SFP-SX Xcvr 9 REV 01 740-011782 PBB1J0E SFP-SX PIC 2 BUILTIN BUILTIN 10x 1GE(LAN) EQ Xcvr 0 REV 01 740-011613 PBN09GR SFP-SX Xcvr 3 REV 01 740-007326 P5S0P6E SFP-SX Xcvr 5 REV 02 740-011613 PJH4SLD SFP-SX Xcvr 8 REV 01 740-014132 6492476 SFP-T PIC 3 BUILTIN BUILTIN 10x 1GE(LAN) EQ Xcvr 0 REV 01 740-013111 7447674 SFP-T Xcvr 4 REV 02 740-013111 B147560 SFP-T Xcvr 9 REV 01 740-011782 PBD25BG SFP-SX FPC 5 REV 23 750-031092 ZA0366 MPC Type 1 3D Q CPU REV 06 711-030884 YY6447 MPC PMB 2G MIC 1 REV 20 750-028380 YZ4928 3D 2x 10GE XFP PIC 2 BUILTIN BUILTIN 1x 10GE XFP <<<<<<<<<<<<<< Xcvr 0 NON-JNPR CA06BK016 XFP-10G-SR PIC 3 BUILTIN BUILTIN 1x 10GE XFP Xcvr 0 REV 03 740-014289 CA46BQ08B XFP-10G-SR QXM 0 REV 05 711-028408 YY4352 MPC QXM Fan Tray Enhanced Left Fan Tray

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