Continuous part after copy

With some regularity, a situation arises when copying or making circles in which the copied part is not seen by SU as a continuous part.
Learned through the tutorials (thanks Aaron :slight_smile: that this can be solved by redrawing a segment.
Can this issue be prevented? Am I doing something wrong? See examples below:

Try to use Origin as center, use inferences and no guides are needed

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Thanks for your comment. Unfortunately, this suggestion does not resolve the issue. While watching your video and testing I did find the solution… See video. The only question that remains is what the reason is.