Talking with gm's in game i'm writing here. I'm playing a spellsword and i found many bugs that i try to report here because is not easy to explain.
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First bug : Conflict with Shashbucler bonus to damage (Insightful Strike)
.As i see the bonus from Insightful Strike is a temporaney boost on the weapon. I have 3 levels of shasbucler and +5 int so i get +3 damage (you can see in the image +3 piercing damage) limited by the levels into swashbucler class

Now, the bonus appleys only when you draw the weapon from your inventory stacks well with other spells like Superior magic weapon, but here comes the first bug.
If i imbue this weapon i will lose the swhasbucker bons : Look -->

as you can see now the weapon have the +D4 frost damage from the element choosen and the Spellsword power related to the element (it is in italian but is the second half with unic power level 9).
Now if i put the wepon in my inventory and back in hand, i will get the bonus from swashbuckler back but i lose the unic power related to the element.
Only the + damage is still applyed.

This is the first huge problem because the most attractive thing in spellsword class is the power related to the element and not the + damage.
Of course this is not working as intended as someone says because reporting from arelith wiki : Spellswords can only imbue their own equipment. if an imbued weapon leaves the spellsword's inventory, it will lose all its buffs.
The weapon never left my inventory, and when it does it loses ALL the buffs ( and that is the part working as intended)
Second BUG : Conflict with Temporary essences (weapon)
.Like the bug i just described is the same with temporary essences for weapons :
Quote from the Wiki : The imbue can stack with nearly any weapon buff. Restrictive weapon buffs (those that require the weapon to be blank) must be cast BEFORE imbuing, and the same applies to weapon essences.
Now if i put an essence BEFORE an imbue like this :

Now i Cast a random imbue

I lost the Damage from essence and the damage from Shashbucler too and got the +d4 Electric and the power from electric element. Note that this bug was the same even before i got levels in swashbucler, deleting the essence damage too.
Again if i put the weapon in my inventory and draw it again :

I got back the damage from Swashbuckler Insightful Strike (+3 piercing damage) but i lost the Hit power Electric and only the +d4 damage (electric)is still active.
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Third BUG : Conflict with Dual Weild
.The last bug i discovered is about dual weilding. When you dual weild and puts 2 different kind of elements on the weapons ( cuz if you put the same there is the internal CD that blocks the same proc -> Quote from the wiki : he on-hit property of the imbue can only trigger once per hit in a Flurry, or every two seconds. Characters with more than 3 attacks benefit less from Imbue effects (if character has a majority of levels in Spellsword). ) the weapons works fine untill you put them back into the inventory and draw them again.
First of all i imbue both weapons :



As you can see the Bonus From Both elemets works fine ( but i somehow lost again the damage from Insightful Strike of the Swashbuckler) , so we have both weapons with +D8 damage and + power on hit of both elements.
Now if i put em into inventory and draw again :


The main Hand lost the power on hit by the elements ( but it still has the +D8 damage and got back the power from swashbucler), but the offhand still works fine with all bonuses active
Note that this kind of bug was the same even before getting levels into swashbuckler so with no Insightful Strike.
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Fourth BUG : Bonus +d Damage stacking when the weapon is bugged and lose the power on hit by spellswsord
.When the weapon bugs putting it into inventory and draw it again , for some reason, you can stack the damage from imbue.
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First i Draw the weapon

Then i imbue with Acid this time ( is the same for every element)

As you can see , like we told before, i lost the damage from swashbucler but got the D4 Damage from acid and the power from acid.
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Now i put the weapon into my inventory and draw again :

As always , lost the power from acid, got back the +3 piercingi damage from swashbucler and the +d4 acid damage is still there.
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Now i add a second imbue :

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As you can see i lost the swash damage but now i got the second imbue on the weapon with the working power on hit.
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Now if i put it back into inventory and back into hand :

The mechanic is the same.
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This are the bugs i've found on the spellsword, i hope it was clear with the screenshot to help.
Is quite hard to play this char right now because of the bugs at least for me.
I hope this will help Devs, if you have any question do not hesitate to contact me back ( Vindir )
Bye