Question About AoE on Green

[Thievery]

Read in a couple different spots that AE spells will be limited to hitting 4 mobs on green. Is this because of the bug that existed prior to the Sept. 1999 patch or is that something that is just purely implemented for this server?

Thanks in advance. Tried to do my research before posting here. Haven't been around the 99 community in a few years.

[Baler]

It's how it was during classic prior to a certain patch.

after that patch the limit will be 25 because "p99 classic"