Shroomlight texture doesn't load and turns into purple block

So on my minehut server I placed some of these shroomlights, then I went offline and the server closed. When I came back and restarted the server, all the of the shroomlight's textures became identical to the purple concrete texture. I tried rejoining, but it didn't work. When I tried replacing them, it didn't work as well. The texture in my inventory also was identical to the purple concrete texture.