Please, increase the size of selection list field in terms of number of entities for copy/paste from field to plot result.
There is an limitation in characters around 4100 - 4500 for selection list field . So number of words for nodes, triangles, tetras will vary depending on the actual entity number, so rough estimation will be 400 to 800 entities.
This limit the numbers of entities to be selected and used for path plot or xy-plot.
So sometimes not enough, but depends on entity and numbers of entities.
See topic: Copying large number of element IDs from 'Selection' to 'XY Plot'
Thanks.
Regards,
Berndt