Small ICMP packets are not susceptible by MTU. ICMP works or not?
First, your config for trunk interface has some mistakes.
Read carefully this KB: https://kb.juniper.net/InfoCenter/index?page=content&id=KB17419&smlogin=true&actp=search
You need to remove native-vlan form vlan members list. That is solution for untagged vlan traffic.
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Re: Set a trunk port with access VLAN issue
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