button "new messages" to jump to the first new message in a text channel

[Heinz14]

Describe the problem

There already is a button "jump to latest" but we need a button "jump to first new message" to jump to the first new message in a text channel.
Currently we have to scroll up till we find the marking for the start of the new messages and that can be quite a way.

Describe the solution you'd like

We need a button "jump to first new message" to jump to the first new message in a text channel.

Alternatives considered

No response

Additional context

No response

[Septicity]

This is already implemented:

That said, it doesn't seem to show up/behave consistently...

[Heinz14]

It seems to work now, but didn't as I posted that.