I have never heard of anything even close to this before. My vote is myth/rumor/joke.
Maybe I am missing something?
As "rumor" goes, somewhere in the treasure room scene on PotC, Tink suppsoedly resides there. There are other appearances of other characters (Beast, Pooh, Goofy, etc) throughout the ride - the majority of them being included as shadows and silhouettes (e.g. The lady who is concerned about her dear Carlos drowning, when the windows are shut, her silhouette purportedly resembles a silhouette of Pooh).
"Disneyland is a work of love. We didn't go into Disneyland just with the idea of making money" - Walt Disney
If Tinkerbell is there, will they be putting Jack Sparrow on Peter Pan's Flight?
"You can cut me off from the civilized world. You can incarcerate me with two moronic cellmates. You can torture me with your thrice daily swill, but you cannot break the spirit of a Winchester. My voice shall be heard from this wilderness and I shall be delivered from this fetid and festering sewer."