Playing around with the new command names, I've found that the [r=5] aka radius command now named distance, isnt working.
As an example. effect give @e[distance=10] minecraft:luck 10 5 true.
shows no entity found, same for @a @p etc...
If I'm using the command wrong I do Promptly apologise and would greatly appreciate being corrected.
Use ..10 for "10 or less blocks"