Block isn't visible in Minecraft Inventory

Hello,

I'm new here. I installed the latest version of MCreator. I started a Workspace (Add-On for Bedrock Edition 1.16.x) and add a block (Rubics Cube).

Then I have created .mcaddon, changed version from 1.16 to 1.14 and imported addon in MineCraft Education version. Import was succesfull.

But my new block isn't visible in Inventory.

First my idea was, to change property "Creative inventory tab" on block, but I cant do that (it's Not supported!). Also, I cant change number of properties on a block.

Can you help me, how to use full featured MCreator and how to make my block visible in Inventory in Minecraft Education?

Thanks.

B. Strnad