There is a specific corner case for a relation expression and filling calues of new column as copy and paste.

The most important step to reproduce the issue is to insert column left. If column is inserted right, the feature works.

The issue was found during PR review

Steps to reproduce

• Select expression type as Relation
• There will be single column
• Prepare three rows, fill them with some value
• Insert column left, so you needs to have a state like
• Select the three values of the first column by dragging a rectangle over three given cells
• Press Ctrl+C
• Select top cell of the second column
• Press Ctrl+V
• An error will appear