From the Ubuntu bug report.
"
Write "something" to empty cell. Click Input line, choose all with Conrol-A,
click hyperlink. Add a target, apply, close.
After that click Input line again, press space and type "Text". That text goes
middle of the "something". Cell now shows "somextething T". Input line still
shows "something Text", but it changes. See picture calc1. Problem seems to
occur especially when using slash-mark or capital letter, but it can also appear
without them.

Sometimes text goes where it should go, but cell is no more hyperlink and
pressing backspace will cause disappearing of first letters instead of last
ones, as if cursor would be in the middle of "something".
"

Verified on official 3.0.1