Buggy "empty" potion effect

The bug

/effect can apply a buggy potion effect called "empty." It does nothing, has no translation or icon, and apparently can't be removed until a relog.

How to reproduce

1. /effect @s regeneration 100 1 true
2. /effect @s empty
3. /effect @s clear
→ You're still creating particles

Expected behavior
Second command should be a syntax error