I'm new to the forums, so sorry if this is incorrectly tagged/formatted. It looks like the mod "Portal Cubed" incorrectly shows no compatibility for 1.19. There is no file for 1.19 on the curseforge page that aternos links for you, but there is one on the modrinth page. I tried plugging the modrinth link into the mod suggestion box, but I was met with an error stating that this mod was already available.
Third attachment was taken on a 1.19.0 fabric server.