Problem

If reference field in task has different tags compared to currently edited one it will be impossible to save segment with desired tags.

Hardly possible to test in local env.

Was found in process of handling repetition bug where after processing source had less tags then target and they were different to add to that.

So once user tried to insert target from source and save segment it either poped error or replaced desired source tag with one of current tags from target.

Solution

Change order of searching for needed tag.