Regional collision detection

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I placed a part in an area to detect whether a player has entered the area, but sometimes the collision cannot be detected when the player enters the block. The player needs to stop in the part before it can be detected. Why is this

Here is the code I used:
function isPlayerInZone(player,TouchPart)

local character = player.Character
if not character or not character.PrimaryPart then
	return false
end

local detectionZoneCFrame = TouchPart.CFrame
local detectionZoneSize = TouchPart.Size

local charPosition = character.PrimaryPart.Position
local localCharPosition = detectionZoneCFrame:pointToObjectSpace(charPosition)

local halfSizeX = detectionZoneSize.X / 2
local halfSizeY = detectionZoneSize.Y / 2
local halfSizeZ = detectionZoneSize.Z / 2


return (localCharPosition.X >= -halfSizeX and localCharPosition.X <= halfSizeX and
	localCharPosition.Z >= -halfSizeZ and localCharPosition.Z <= halfSizeZ)

end

for i,v in pairs(Tag) do
v.Touched:Connect(function(part)

	local character = part.Parent;
	local player = Players:GetPlayerFromCharacter(character);

	if player ~= nil and isPlayerInZone(player,v) then

		if waitPlayerList[player.UserId] == nil then
			waitPlayerList[player.UserId] = player;
			TouchPart[player.UserId] = v





		end
	end
end)

end

RunService.Heartbeat:Connect(function()
for _, player in pairs(waitPlayerList) do

	local Part = TouchPart[player.UserId]
	if Part then
		if not isPlayerInZone(player,Part) then

			TouchPart[player.UserId] = nil

			waitPlayerList[player.UserId] = nil;







			return
		end
	end


end

end)