Operating system: Win10 Home 64
Graphics card: rtx3070
Exact steps to reproduce the error:
-Make a grease pencil object
-Create a fill shape
-Draw a stroke above the fill, and one stroke behind it
Select both strokes and try to use "Bring to Front" or "Send to Back"
If one of your selected strokes is already in the very back/front, nothing happens. If one of your selected strokes is already in the front when you "Bring to Front" it should ignore that one and still move the other selected strokes to the front. Instead, it just ignores all of them.
 This also happens with "Bring Forward" and "Send Backward."