Just confirming that this is still a bug. I’m using version 1.5.12 on macOS, and get the exact same behavior as described in the initial report. I can manually fix the subsequent numbered items after the bulleted sub-list, but then if I add another bullet list item, the numbers reset again.
Same problem in v1.7.7 on Linux.
Couriously, reverting the last action after pressing ENTER resets the modified numbers. Only the second revert resets the insertion of a new bullet point.