If I select a textbox inside a table and then press an arrow key in the keyboard, the textbox does not move.
If I use alt+(Up, Down, Left, Right) it also does not move, but the table cell size is changed instead.

I find the alt+key misbehavior very annoying because alt+key would let the user precisely position the textbox, which become instead an impossible task.

I can reproduce the problem with any new Writer file, for example:

- create a new file;
- create a 1x1 table;
- create a textbox inside the table cell;
- use U,D,L,R keys or alt+(U,D,L,R) and see the bug.

Using libreoffice 7.6.1.2 in Ubuntu 20.04

If matters, please note that the bug does not happen with Impress.