@Fantastic: It doesn't look like replacement nibs and a nib remover tool were included with the Tab S6 Lite. If you're unable to find any suitable replacement nibs, I recommend reaching out to our Help Desk to explore your options regarding a replacement S Pen.
the Tab S7 doesn't come with any of these: http://lcx.me/?3QYw3. The reason for this is that the nibs have been improved on this model so this shouldn't suffer any damage. If you have any issues in the future please reach our Support Team so they can help you with this: https://www.samsung.com/uk/support/