[1.10] Cannot perform a pick operation on custom entities

Partner Rank: 2

Verification builds and Platforms:

1.10.0.7 Win10

Summary:

When performing a pick operation on a custom entity in creative mode, a spawn egg of that entity is not placed in your inventory while this does happen with existing entities

Impact:

Feels unintentional and like an oversight. Adding this feature would complete AddEntity more and would help during development and creative play

Repro Steps:

1. Open the world in the mco_shapescape chat on Slack
2. Navigate to any entity near your start location
3. Scrollwheel click on the entity

Observed Results:

Nothing.

Expected Results:

The spawn egg for the entity appears in your inventory.

Screenshots/Videos attached: No

Regression Builds:

Notes