Hello Today I switched from Permissionsex to LuckPerms and I must say I love it, but I crossed by to a problem.
I used this method to allow cerian groups to enter a specific area protected with world guard:
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/region flag Stuff entry deny
/region addmember Stuff g:CoolPeople
/region flag Stuff entry -g nonmembers

Then I'd add the permission node "group.CoolPeople" to the CoolPeople group in your permissions plugin's config.
full thread click here
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and the problem is for example i have a region only for vips and the permission node is group.vip to enter it messes up the inheritance of the permissions for the mvp group or the region entry denial doesn't work

if there is a way to fix this please tell me.

Groups are lowercase and not uppercase.

LuckPerms internally uses the group.<group name> permission to denote group membership.

So for example, it's not possible to give user x the group.admin permission, without automatically making them a member of the admin group.

My suggestion for solving your issue is to just add all of the LP groups you want to access a region to the definition in WorldGuard.

e.g.

/region addmember Stuff g:vip
/region addmember Stuff g:mvp
... etc