I have multiple automatic flower farms in a flower forest. In previous versions, if you bone meal a grass block in a flower forest biome and get flower, that is the flower you will get every time you bone meal that block, it does not change. This was mentioned in ilmango's flower farm video. These farms have worked from 1.14 to 1.17; they still work in 1.18 however, the type of flower you get completely changes this, I've recreated this in multiple seeds (attached below). I did this by generating a random world with only the flower forest biome. Then used command blocks to remove all grass and tall grass centred around 0,0 then spammed bone meal. The position of the flowers has evidentially changed between versions. I also believe that cornflower (the blue) flowers do not spawn, if they do it seems to be incredibly rare.