restore from snapshot - color restore?

[Elementari]

SB 8.4.0 / FF MacOS (Sonoma); 147.0.2 aarch64
1)
tabs manually colored with sidebery
saved to snapshot in sidebery
tree structure and colors are visible in snapshot viewer
restore a window from snapshot viewer -> tree structure restored, colors not restored.

versus
2)
single colored tabs closed, then undone/restored -> color preserved
3)
close firefox, reopen: colors of tabs preserved.

comment:
if this is a bug, I would much appreciate if legacy snapshots that do show colors in the snapshot viewer would load correctly with colors. thanks a lot.

[Elementari]

I would like to add that since it is not possible to snapshot just a window, the workaround to open just that window after snapshotting all windows (which works) is affected by this since due to the problem described above, coloring will be lost. And the main point for me was to snapshot a window to preserve the coloring. Of course I could just ignore the other windows that are co-saved, for the time being. But again, eventually I will want to restore and continue working on that window, and for this I need it to restore the colors.
PS

• deleting a snapshot also could use a confirmation dialogue perhaps?
• restoring a window via snapshot restore also takes ages (like 5 minutes with just 175 tabs) whereas loading FF with 2000+ tabs is fast. What takes so long is the sb pane from being displayed. It is empty until it has loaded. Edit. I tried again and it worked fast. Not sure why. Previously it had not loaded fast multiple times.