find -regex -execdir mv... missunderstanding or bug ?

[alexandre]

Hello list,

Does the following behavior qualify as a bug or am I doing something
wrong ?

Thanks in advance for your input,
Alexandre

_________________________________________________
$ tree -F
.
|__ test/
|__ TEST01

1 directory, 1 file

$ find -regex ".*TEST01" -execdir mv '{}' test \;

$ tree -F
.
|__ test/
    |__ test

1 directory, 1 file
_________________________________________________

This is findutils-4.4.2 from debian/sid.