Defend Area placement bug

So I was going to set a knight to defend an area in a crystal and I got that bug, I am no sure if this bug is already been tracked or if it has been posted in these forum already, in that case, I am sorry.
Here is the bug shown in a little video:

https://youtu.be/qmobqA6u00c

Btw: sorry if something is not expressed correctly I am not an English native speaker
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