About the questions:
What exactly do you mean with ‘break up’ (e.g. stops annotating the polygon, creates two polygons… or something else)?
==> The annotation is closed = finished. A single small annotation is created.
I happeny very regular short time after starting an annotion. Often, several vertex points are generated at the beginning, even if I click only 1 time and begin to move the mouse. The break up/closing of the annotation can happen even without a second click.
The problem can be avoided by annotating very slow.
Question: The issue has now a headline coping with RAM effects. Shall I open an issue in github with the headline "Polygon tool closes in short after beginning to annotate?
Can you reproduce the issue consistently?
Does it happen even without any other objects in the image, or only if other objects exist?
Does simply starting an annotation more slowly resolve the issue?
==> No. Only sometimes.
The problem appeary with all tested image formats till now.