Weird Sunbird behaviors

Platform, device version and operating system
Windows 10 x64

Screenshot or image
Not available

What you were expecting to happen, and what actually happened
Sunbird is not the same after resurrection.

How often does this happen? When did it begin happening?
Seems connected with summoning rules.

Steps to make it happen again
While Sunbird retains it’s magic, it’s all right. I blast L19 Sunbird, and I get L19 Sunbird back. Well, I’ll lost any trait bonuses, but I described it in other bug report already.

But if magic fallen, results became strange. Very strange. I can confirm that newly bird will be lower level (I seen it down to L13, for example), losing all associated parameters - but it seems regains levels back somewhat, if I’ll blast it again! (After my second resurrection it was about L15, for example).

I believe, it connected with summoned rules, where new summoned creature is limited by caster magic. But… it must be different with sunbird, right?