invisible shulker

Are you using any mods?

[Mojang] Thommy Siverman, no

[Mojang] Thommy Siverman, before the game starts, the texturepack is installed (in lucky island mode on the cubercraft server), but in 1.14.4 everything was fine and there wasn’t

This is a non-vanilla server. Check if you can reproduce this issue in singpleplayer. Also make sure you have a compatible resource pack.