UV bugfix (?)

Hy guys. In Uv editor when you select your uv islands you want to working on then disable "Uv Sync selection", Blender drops the selection in the Uv editor.

However if you select all your uv Islands in the Uv editor while Uv sync selection is disabled then turn on Uv sync selection Blender notes this and next time when you turn on and off uv sync selection for this uv islands Blender doesn't drop the selection.

Looks like a bug for me what do you think?