https://gist.github.com/bloodmc/c3f1425fb95bc0355a98d9233b807c18

As you can see from log, I am passing valid context data.

Here is the json group data

{
"name": "testers",
"perms": {
"griefprevention.user": true,
"(gp_claim=226d8ad5-77eb-4a17-a55a-8ad926d9a49d)minecraft.command.give": true
}
}

Using latest build 75