Syntax error when using /summon xp_orb command

Steps to Reproduce:

1. Create a new world with Cheats enabled
2. Type /summon xp_orb in the chat

Observed Results:
Chat says "Syntax error: Unexpected "xp_orb": at "/summon >>xp_orb<<""

Expected Results:
Experience orb is successfully summoned.

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Original Description:
The Command "/summon xp_orb ~ ~ ~" Is Not Working 

I Had A Command Block With /summon xp_orb ~ ~-2 ~" In It And It Stopped Working With The 1.17 Update..

If I Try And Type That In Chat I Get This Error Message

Syntax error: Unexpected "xp_orb": at "/summon >>xp_orb<< ~ ~-2 ~"

Was This Removed From The Game?