MTU issue with vlans

We have incomprehensible problems: MTU issue after make a vlan setup.

Config at MX480 side:

show configuration interfaces ae1

vlan-tagging;
mtu 1518;
aggregated-ether-options {
minimum-links 1;
link-speed 10g;
lacp {
active;
periodic fast;
}
}
unit 300 {
description localnet;
vlan-id 300;
family inet {
rpf-check {
mode loose;
}
address x.x.x.x {}
...
}
unit 350 {
...
}
...
}

Config at EX4550-VC

admin# show interfaces ae1 
description "to MX480";
aggregated-ether-options {
    minimum-links 1;
    link-speed 10g;
    lacp {
        active;
        periodic fast;
    }
}
unit 0 {
    family ethernet-switching {
        port-mode trunk;
        vlan {
            members [ vlan_300 vlan_350 vlan_400 vlan_450 vlan_500 vlan_550 vlan_800 ];
        }
        native-vlan-id 1;
        filter {
            input udpRate;
        }
    }
}

I try add/remove mtu 1518; at MX480 config.

MTU size:

MX480:

show interfaces ae1 detail | grep MTU 
  Link-level type: Ethernet, MTU: 1518, Speed: 80Gbps, BPDU Error: None, MAC-REWRITE Error: None, Loopback: Disabled, Source filtering: Disabled, Flow control: Disabled
    Protocol inet, MTU: 1500

EX4550:

admin# run show interfaces ae1 | grep MTU 
  Link-level type: Ethernet, MTU: 1514, Speed: 80Gbps, BPDU Error: None,

Server connected to port of 4550:

admin# run show interfaces xe-2/0/13 
Physical interface: xe-2/0/13, Enabled, Physical link is Up
  Interface index: 152, SNMP ifIndex: 675
Link-level type: Ethernet, MTU: 1514, Speed: 10Gbps, Duplex: Full-Duplex,

MTU issue at server:

wget -O /dev/null https://mirror.leaseweb.com/speedtest/10000mb.bin
--2019-10-11 04:08:51--  https://mirror.leaseweb.com/speedtest/10000mb.bin
Resolving mirror.leaseweb.com (mirror.leaseweb.com)... 37.58.58.140, 2a00:c98:2030:a034::21
Connecting to mirror.leaseweb.com (mirror.leaseweb.com)|37.58.58.140|:443... connected.
-- stuck --

root@ubuntu:~# ifconfig enp13s0f1 mtu 1496
root@ubuntu:~# wget -O /dev/null https://mirror.leaseweb.com/speedtest/10000mb.bin
--2019-10-11 05:16:09--  https://mirror.leaseweb.com/speedtest/10000mb.bin
Resolving mirror.leaseweb.com (mirror.leaseweb.com)... 37.58.58.140, 2a00:c98:2030:a034::21
Connecting to mirror.leaseweb.com (mirror.leaseweb.com)|37.58.58.140|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 10000000000 (9.3G) [application/octet-stream]
Saving to: ‘/dev/null’

/dev/null                                                    5%[======>                                                                                                                                  ] 514.04M   284MB/s               ^

Any ideas - how to fix it???

P.S.

admin# run show version
Model: ex4550-32f
JUNOS Base OS boot [12.3R12-S14]

--

show version
Model: mx480
Junos: 17.3R3-S4.2