Expected targetIds to be registered
With the current version of the sortable tree I get this error message: Expected targetIds to be registered. when sorting items to the bottom (see the attached gif for the use case). I found a similar issue in the "old" react-sortable-tree project here and it seems like this issue only occurs in dev mode. Is there a way to solve this issue? My current workaround is using react-dnd in version 13 instead of 14 but I don't think this will work forever.
Here is my Codesandbox setup.

Hi! I know about that issue and planing to upgrade to react-dnd v15. I think, this issue also should be fixed in the new version of react-dnd. But I'm not sure when I can do it actually. I'm too busy and maybe I can start working on it in end of April or May. If someone has the same issue and s/he want help with this - PR is always welcome.
@nosferatu500 I'm facing similar issue. I can help you migrate if you can guide me with what should be done here to fix it.
https://github.com/react-dnd/react-dnd/pull/3432 this maybe helps, and according to npmjs, this has been fixed only since 16.0.1 (the latest version for now)
Чтобы обновиться до 16 версии нужно переписать все на хуки. Это в планах: link