Bug in "page number" + offset

Hi,
I noticed a bug in the page numbers. They cannot exceed the real number of pages which leads to 
unnumbered last pages when using an offset.
I'll illustrate this with an example.I have a document with 6 pages.I go in the footer and then 
from the menu "Insert" I add "Page Number". I double click it and put an offset 3.
The result: On page 1, 2, and 3 I have page numbers 4, 5, and 6.On pages 4, 5, and 6 I have no page 
numbers.
I have found this behavior both under Windows and Linux.
Version: 6.2.8.2 (x64)Build ID: f82ddfca21ebc1e222a662a32b25c0c9d20169eeCPU threads: 4; OS: Windows 
10.0; UI render: default; VCL: win; Locale: en-US (en_US); UI-Language: en-USCalc: threaded
Version: 6.0.7.3Build ID: 1:6.0.7-0ubuntu0.18.04.10CPU threads: 4; OS: Linux 4.15; UI render: 
default; VCL: gtk3; Locale: en-GB (en_US.UTF-8); Calc: group
Best wishes,Ivaylo Belev, Bulgaria