In missions where I have to beat 2 waves of enemies, often additional enemies keep respawning. Specially with the tougher enemies this makes these battles absurdely hard. I don't know if this intended to be this way but get's kind of frustrating.

I don't like these that much etiher, but you can leverage the situation by bringing Kay and spamming shields when it's down to one or two enemies. On the other hand, Kay turns into a potato on missions where you have to win in X turns...

you can add this one to the list:

Dungeon completion not validated on Kingdom Quests tab after finishing the whole dungeon exploration abd clearing every node...

i dont know if it can be reproduced, but when it happened, i in fact could clear every node of the dungeon except for the camping/resting node that i kept until the very end (camp node was last node i visited) and i finished my exploration of the dungeon with the camp one, which made me exit/end the dungeon run but... no check box crossed in kingdom quest tab.

Since I didn't see it in the list:
Festerlands fight with 2 waves. I killed the last enemy with a firewall, not getting the second wave at all. For some reason I didn't get the second objective either in spite of not using any signature abilities. Only occurred with the firewall. This was my second clear of the fight after having to load.

Other minor issues:
At least in the inventory when I select a category to browse, such as "regular", I have to scroll manually to get the items visible again, otherwise they are invisible.
Graphical bug showing double RP points for adventures, I had one for both Griffith and Signy in the Festerlands.

Bad typesetting on Chapter 5(?) quest:

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Crackpot, Hypocrite, King achievement (secret) is not unlocking - I did the correct path to expose Bink 3 times already and it will not pop. Checked the stats - there is one secret achievement with 0.0% global completion rate. Please fix it:)

And that about this? maybe its specific to Linux, but i see hordes of various graphical glithes all the time. Im most cases they minor - characters turned in wrong direction, looks awkward but not hurts, but often they star to lie on ground, rotate their heads horizontally or, worse, vertically and so on...
Also game leaking memory for me - prolonged gameplay tends to cause crashed and with limited save abilities its just "awesome".

I'd hate to say it, but more and more play Unity based games more i start to understand why usage of Unity if often called "confession of dilettantism".