Your first screenshot is not pinging no destination from vlan 10. That screenshot is from clicking ping appliance which is from dashboard to the appliance. Why you're getting so much loss and latency I don't know. I'd open a Support case.
Pings sourced from VLAN interfaces to internet don't make it through NAT and won't work. You can ping from VLAN interfaces to internal IPs though.
Ryan / Meraki SE
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