Hi, when I made a mod with the curios api and launched the game for the first time, I noticed that the interface did not open.
And strangely this bug does not occur if I put the mod on modpack (like Better Minecraft).
If I put the two mods together the interface doesn't open, but on a big modpack it does.

build.gradle : https://github.com/Samlegamer/PotionRingReforged/blob/1.16.5/build.gradle

Did you add slots? Curios does not add any slots by default, which would mean the interface is empty if you did not add any slots.

So that was it, thank you!