Nodes are rearranged when additional edge is added

[natalya-k-dblue]

Hi Community,
I am looking to build the flow like this (nodes 1.a.a and 1.a.b should be on the same level horizontally). but i also need to add an additional edge between the nodes 1.a.a and 1.a.b (the edge is not interactive - whether it is added or not , is calculated in the code upon adding any new node).

However, after the edge between nodes 1.a.a and 1.a.b is added my nodes get rearranged in the following way while i want to keep them at the same level.

As i understand it might be connected to the layout being used or layout options configured. I tried to use different layouts with different layout options from https://eclipse.dev/elk/reference/algorithms.html . However, it did not manage to find the right combinations. Would appreciate ideas / solutions how to solve the issue.
Thank you,

[natalya-k-dblue]

found solution