When I configure the ACL-plugin with the provided Postman request, VAT dump shows:

vat#acl_dump
ipv4 action 1 src 0.0.0.0/0 dst 0.0.0.0/0 proto 58 sport 125-130 dport 0-0 tcpflags 0 mask 0

and the classifier does not match icmpv6 packets, as they are all ipv6.

Equivalent configuration in VAT:

vat#acl_add_replace ipv6 action 1 sport 125-130 dport 0 proto 58

does produce the expected result:

vat#acl_dump
ipv6 action 1 src 0.0.0.0/0 dst 0.0.0.0/0 proto 58 sport 125-130 dport 0-0 tcpflags 0 mask 0