is bleach episode 259 filler?

At the Sōgō Kyūgo Tsumesho, 4th Division Lieutenant Isane Kotetsu enters 8th Division Lieutenant Nanao Ise's office and greets her before asking Nanao if she would like some tea. Wondering if she has been here for so long, Nanao apologizes for taking over Isane's desk like this.

Stating she does not mind, Isane says these temporary quarters make her feel like she has gone off to camp before stating she is somewhat enjoying it even though she knows it is silly. As Nanao smiles and says she knows what Isane means, Isane realizes something and reveals 5th Division Lieutenant Momo Hinamori brought in some cookies which she baked herself.