Unable to execute /particle entity_effect

Can confirm. It seems to expect some new additional parameter, but there's nothing in the changelog to indicate what that might be, and blind guessing at a valid input has yielded no results thus far.

I believe this is caused by the command expecting an integer immediately after (i.e. entity_effect1), rather than one space after. 

See screenshots comparing this and dust;

Can confirm in 24w11a