missing tags during tagmanager.moveTag operation

Hello,

We are using CQ5.5 SP2 and tagmangar API to move tags using the API given below and during this process observed that occasionally couple of tags missing at target location. This is happening when there are multiple rename or moves happening in the same hierarchy.

Tag targetTag = tagManager.moveTag(sourceTag, targetTagPath);

Is this known issue? Has anyone faced similar problem? Any daycare ticket or hot fix available for the above given problem?

Thanks,

Sastry