A torrent creation tool that can...

[snippsat]

so it seems, torrent creatores are not compatible with symlinks...

Can use tool torrentool that Gribouillis linked to then it work with .symlink
I test with qBittorrent then it do not work .symlink.

G:\div_code\foobar\down_test
λ torrentool torrent create G:\div_code\foobar\down_test --open_trackers
Creating torrent from G:\div_code\foobar\down_test ...
Fetching an up-to-date open tracker list ...
Torrent file created: G:\div_code\foobar\down_test\down_test.torrent
Torrent info hash: b9ad40ac43b4a2444f77da36c11063fb22c2f908

Then if eg down_test.torrent in qBittorrent will see that all files have right original file size.