SNMP - Interface stat shows wrong value for all virtuals interfaces

Hi,

Query information via SNMP shows wrong data for virtual interfaces ( PPP, VLAN )
Example:

Interface type( name ).
OID: .1.3.6.1.4.1.14988.1.1.14.1.1.2

mtxrInterfaceStatsName.1	Eth1	( physical Ethernet port )
mtxrInterfaceStatsName.2	Eth2	( physical Ethernet port )
mtxrInterfaceStatsName.3	Eth3	( physical Ethernet port )
mtxrInterfaceStatsName.4	Eth4	 ( physical Ethernet port )
mtxrInterfaceStatsName.5	Eth5-Wan-Main ( physical Ethernet port )
mtxrInterfaceStatsName.15	Bridge-Home (BRIDGE )
mtxrInterfaceStatsName.17	Bridge-Monitoring (BRIDGE )
mtxrInterfaceStatsName.19	Bridge-Guests (BRIDGE )
mtxrInterfaceStatsName.23	Mariano2Partner (PPP)
mtxrInterfaceStatsName.33	Vlan300 (VLAN )
mtxrInterfaceStatsName.36	Vlan400 (VLAN)
mtxrInterfaceStatsName.15728688	<l2tp-Partner2Mariano> (PPP)
mtxrInterfaceStatsName.15728691	<l2tp-Ogrodowa2Mariano> (PPP)

And here is result from SNMP
RxBytes: OID: .1.3.6.1.4.1.14988.1.1.14.1.1.31

mtxrInterfaceStatsRxBytes.1	16725567836
mtxrInterfaceStatsRxBytes.2	0
mtxrInterfaceStatsRxBytes.3	0
mtxrInterfaceStatsRxBytes.4	249263377
mtxrInterfaceStatsRxBytes.5	95234697616
mtxrInterfaceStatsRxBytes.15	0	
mtxrInterfaceStatsRxBytes.17	0	
mtxrInterfaceStatsRxBytes.19	0	
mtxrInterfaceStatsRxBytes.23	0	
mtxrInterfaceStatsRxBytes.33	0	
mtxrInterfaceStatsRxBytes.36	0	
mtxrInterfaceStatsRxBytes.15728688	0
mtxrInterfaceStatsRxBytes.15728691	0

Attached screenshot from WinBox showing correct data.
wb.jpg
The same is for Tx data

Device: RB750Gr3, 6.40.4
Device: RBwAPR-2nD ( LTE KIT ),6.41rc47 also doesn’t show value for LTE interface