The Bug
Normally with flowers that make suspicious stew you can feed them to brown mooshrooms to get the suspicious stew from them. Since flowering azaleas and flowering azaleas can now make suspicious stew you cannot feed them to brown mooshroms to get suspicious stew.
Reproduce
Get a Brown Mooshroom
Feed it a small flower like a wither rose
✔ Notice it eats itGet another Brown Mooshroom
Feed it a Flowering Azalea or Flowering Azalea Leaves
❌ Notice it doesn't eat them
Can confirm