19th of september 2021 is when the lag police decided that foxes should stack, this update was impleted to reduce lag. So in order to generate the same amount of income from your autofarm, you would have to have 10 times more foxes, resulting in the same amount of entities. This does not make alot of sense to me in terms of reducing lag since you would end up with the same amount of entities at your farm. I find it very unfortunate that the average player was not informed of this change. It was only 8 hours before the daily restart that it was announced a change this big would happen. I would like to be informed of major game changes in the future so perhaps I would have time to think of a decent solution instead of a sudden change that causes a major setback to the players who are now punished for their creativity. As for a proper solution, maybe some sort of block (skull) that behaves like a fox would be a great way to keep these farms possible without causing any lag at all, in fact; it would probably the most lagfriendly autofarm possible. Using a skull type item would count towards the entity tile limit as well.