[MCPE-160826] transform_item event does not work for custom items.

The transform_item event for custom items does not work it shows this error

[Item][error]-Could not transform item into vg:marlin, it is invalid.

I also have these experiments on

spectator mode

holiday creator features

custom biomes

upcoming creator features

gametest framework

molang features

The format version for the item is 1.16.100

Linked issues

Can you please tell us how to reproduce the bug?

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We're tracking this issue in MCPE-159116, so this ticket is being resolved and linked as a duplicate.

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