With a mushroom garden, "garden pick" can be interrupted by a turtle taming adventure
When you're a turtle tamer with a mushroom garden, "garden pick" (or, probably, "garden fertilize") can encounter a turtle taming adventure (This Turtle Rocks!). If this happens, it doesn't pick the garden and just leaves you in the taming adventure.
After a manual "choice 1" it worked.
Revision 20255 (untested) will take the "default" option for any choice other than The Mushy Center while fertilizing or picking the mushroom garden.