PlaceholderAPI with WorldGuard

[MrBenjaroo]

So, I am trying to make a certain command with skript in WorldGuard. If the flag is allowed, deny it. If the flag is denied, allow it. It is a quick way to swap values over, as WorldGuard doesn't have a toggle feature. This is my buggy code:
command /toggleflag <text>:
permission: skript.command.toggleflag
trigger:
# Set the flag based on the argument
set {_flag} to arg-1

# Retrieve the placeholder value directly
set {_flagValue} to "%worldguard_region_has_flag_{_flag}%"

# Debugging output
send "Resolved placeholder value: %{_flagValue}%"

# Check if the value is 'yes'
if {worldguard::worldguard_region_has_flag_pvp} is "yes":
execute console command "/rg flag event %{_flag}% deny"
send "Flag %{_flag}% is set to 'allow' and changed to 'deny'."
else if {worldguard::worldguard_region_has_flag_pvp} is "no":
execute console command "/rg flag event %{_flag}% allow"
send "Flag %{_flag}% is set to 'deny' and changed to 'allow'."
else:
send "Flag %{_flag}% is either 'null' or not recognized."

My issues are as follows:

When reloading this script, it comes up with:

Line 8:
Region "%worldguard_region_has_flag_{_flag}%" could not be found

When executing the command:

Resolved placeholder value: <none>
Flag event is either 'null' or not recognised.

Server version: 1.20.4
I have: WorldGuard, PlaceholderAPI, Skript (and others but they don't matter in this situation)

These plugins are all used massively so replacing is not an option

Please help!