Sticky sidebar with accordion-menu, cell shrink, and cell auto - what am I doing wrong?

[vassilpeytchev]

Hello,

I am trying to set up a sidebar accordion menu (using XY-Grid) that will start in a closed state, and then when the sub-menus are expanded, I want the sidebar to expand as needed. This works as shown at https://codepen.io/vdp2022/pen/yLzzVwg

Once I try to get the sidebar to be sticky, however, things break down: https://codepen.io/vdp2022/pen/JjrrEeQ

Am I missing something? Wrong anchor?

To be clear, the issue is with the dynamic cells (i. e. shrink/auto) - if I set them to medium-2/medium-10, for example, the sticky part works as expected.