Arena Battle without Spell Gems

Hi,

version: 0.15.2 | Win 10 x64
EDIT: sorry it is 0.16.2

Well, I started an arena battle and that Lich Hellcaster suddenly lost all his spell gems in the first battle.
Check screenshot, please
https://imgur.com/a/mzBmEVn
(second image is for prove hat it is arena, see background)

What did I do?
I cannot remember to reload the creatures but it was a little bit odd that the Hellcaster gems were all Life spells like Blistering Radiance.
However, I thought I was lucky with properties. Afterward I realized you got rid of the properties in Arena Battles so it was suspicious from begin with.

Thank you for working on this one.