Like the title says, I can no longer pick up any fish or axolotls in buckets.  No matter how long I hold my finger down while holding the bucket it won't pick them up.  I went into creative mode and made a 1x1x1 tank to put an axolotl in so that I could be sure it wasn't just moving too much to be picked up.  Even when the axolotl wasn't moving I couldn't pick it up in the bucket.  I did the same thing for tropical fish, cod, salmon, and pufferfish in both survival and creative mode with the exact same result.  This has been going on for a couple months and even in the newest version it's still there.