Gold farm portal aren't lighting with fire spread

I've noticed that my gold farm ceased functioning after the most recent Minecraft beta update. The portal in my setup is 9x9 blocks in size. Specifically, the portal lighting mechanism is no longer working. This mechanism involved three observers connected to each other, with a fourth observer in a way that they observe each other, designed to creat a loop. These observers were placed one block away from the portal, with lava positioned above them and trapdoors arranged in such a way that operating the trapdoors would ignite the portal i will place a few pictures of how it is done (the vídeo show de how it is done and the screenshot shows how the observers should be. This system has been a staple in gold farm designs since a few older versions of the game, but it appears to have stopped working in this latest beta version, at least on the two devices I've tested: a Poco F3 and an S23 Ultra.