Issue Summary

Merging cells is not working as expected when there are multiple cells merged already in the table. see screenshot

Steps to Reproduce

1. Create a table 3x6
2. Merge few cells in the table (refer to attached screenshot)
3. Attempt to merge 4 cells from the last column, table breaks

Expected Results

Merging cells in the table should work as expected

Actual Results

Can't merge the cells as the table breaks when attempting to merge (see screenshot)

Workaround

Currently there is no workaround