Mindmap tab disappears from right sidebar upon relaunch

[blqke]

Currently, users can drag and drop a mindmap tab into the right sidebar, as illustrated below:

However, after restarting Obsidian, the mindmap icon disappears from the sidebar even if the tab was pinned:

I am unsure if this is a bug.

If it's not, I believe it would be a useful feature to have, considering that users can already pin files to the sidebar.