"Hide next move" behaves different with mouse wheel or cursor keys

[mliebelt]

Exact URL of where the bug happened

https://lichess.org/study/G8Q49yXj/qXhduLhP

Steps to reproduce the bug

1. Having the same study, chapter 1 set to "Hide next move".
2. Play through the first 5 moves, don't play the last.
3. Now go back (by using the cursor keys) to the beginning, the moves remain visible to both the study creator and all others sharing the same study.
4. Doing in step 3 instead of using the cursor, going back with the mouse wheel, the moves were hidden again.

What did you expect to happen?

When I use the cursor keys, I expect the same behavior as with the mouse wheel. If the mode is "Hide next move", and I go back, the moves should be hidden again. When sharing the study with students (doing online training), the moves should be hidden to the students as well.

What happened instead?

Going back with the cursor keys leads to the moves are taken back, but even when the mode is "Hide next move", the moves are visible to both study creator (normal font, not the usual lighter one) and as well to the students then.

Operating system

Ubuntu 22.04

Browser and version (or alternate access method)

Either Chrome current (Version 133.0.6943.126 (Official Build) (64-bit)) or Chromium current (Version 133.0.6943.126 (Official Build) (64-bit))

Additional information

No response