Why does drag n dropping a tab on itself flattens all tabs above to the level of the tab

[Saya47]

Steps to reproduce

• Open Firefox in a new profile
• Install Sidebery
• Create a bunch of new tabs with larger than 2 depth levels (more than 2 depth)
• On one of the tabs on level 2 which has a lot of tabs before it, drag and drop the tab on itself
• Watch all tabs before it get flattened to level 2
  

Actual behavior

Drag n dropping a tab on itself flattens all tabs above to the level of the tab.

Expected behavior

Drag n dropping a tab on itself should not do anything because it's simply a miss-click, or a miss drag and drop.
I was trying to move my tab as a child to the tab above it I miss dropped it on itself and all my tabs became flattened :(

System

Windows 11

Firefox version

133.0 (64-bit)

Sidebery version

5.2.0

Logs

No response