How to reset the mapexplorer (or any other userdata variable)?

[clearlove]

I tried to reset the mapexplorer of player_classified. I tried the following codes, but it did not work.

clear_the_mapexplorer = function(player)
	if player~=nil and player.player_classified~=nil and player.player_classified.MapExplorer then
		player.player_classified.MapExplorer = nil
		-- GLOBAL.TheWorld.minimap.MiniMap:ClearRevealedAreas()
		player.player_classified.entity:AddMapExplorer()
		return true
	end
end

I check whether mapexplorer has been reset using several print functions. As can be seen below.

clear_the_mapexplorer = function(player)
	if player~=nil and player.player_classified~=nil and player.player_classified.MapExplorer then
		print("old explorer")
		print(player.player_classified.MapExplorer)
		print("old data is ")
		print(player.player_classified.MapExplorer:RecordAllMaps())
		print("old tile can see at is ")
		print(player.player_classified.MapExplorer:IsTileSeeable(200, 300))
		print(player.player_classified.MapExplorer:IsTileSeeable(300, 200))
		player.player_classified.MapExplorer = nil
		GLOBAL.TheWorld.minimap.MiniMap:ClearRevealedAreas()
		player.player_classified.entity:AddMapExplorer()
		print("check if the mapexplorer is cleared")
		print(player.player_classified.MapExplorer)
		print("new data is ")
		print(player.player_classified.MapExplorer:RecordAllMaps())
		print("new tile can see at is ")
		print(player.player_classified.MapExplorer:IsTileSeeable(200, 300))
		print(player.player_classified.MapExplorer:IsTileSeeable(300, 200))
		return true
	else
		print("the player or the mapexplorer is nil")
		if player==nil then
			print("the player is nil")
			return false
		end
		if player.player_classified==nil then
			print("the player_classified is nil")
			return false
		end
		return false
	end
end

The MapExplorer got a new address. However, the "IsTileSeeable" prints True, which indicates it has not been reset. (I reveal the full map before clearing the MapExplorer , I expected "the new tile can see at is" to be followed by "false")