'scrolloffpad', scroll-down on the last line does scroll-up

[gx089]

Steps to reproduce

Ok this could potentialy a bug:

:set scrolloff=999
:set scrolloffpad=1

When cursor is on the last line of the buffer (moved manually), <C-d> performs an upward scroll like <C-u> with the corresponding vim.opt.scroll
A better behavior in this case would be that <C-d does nothing.

Bug see: neovim/neovim#41383

Expected behaviour

<C-d> on the last line (with the settings above) should do nothing.

Version of Vim

vim-patch:9.2.0356

Environment

Logs and stack traces

[gx089]

related: #20058