I have discovered that when using a command with @e with [type = ...] chalkboard (an item from Education edition) appears as an option. The variant with Minecraft: prefix exists as well.
Steps to reproduce
Play a world with cheats enabled
Open the chat
type one of the following: /kill, /tp, /effect etc.
chalkboard appears as one of the possible targets. You can type Minecraft: to see the variant with Minecraft: prefix
Expected result: when using a command with @e [type = ...] chalkboard should not exist.
Observed result: when using a command with @e [type = ...] chalkboard does exist.
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Comments 7
Have checked and concluded that it is a block entity (like signs) as opposed to an entity (like mobs).
Confirmed for android, on the same version.