Wild bristle matron unable to add meta crafting mod

In menagerie tried to beastcraft with Wild Bristle Matron Beast to add a meta crafting mod to a non unique item.
The item is a shaper influenced shield, has 3 suffixes and 1 prefix.
From the 2 Suffixes there are 2 crafted mods: "Can have 3 crafted mods" and "Can not change prefixes".


Expected behaviour: It should add the Meta mod "Suffixes can not be changed"

Actual behaviour: When i try to do the beast craft it says "Item may not have a Mod of this type."

I tried 22 times before giving up.
Reasoning why i expect the behaviour
- The item is non unique
- The item is not corrupted/mirrored
- The item has 2 open prefixes
- The item has only 2 crafted mods and can have 3 (due to meta mod)

I assume the error is as the item already has the mod "Prefixes can not be changed" that the craft fails. As the beast recipe states "add a mod" it should not prevent adding mods, only changing them (checking on crafting bench it seemed as i could craft Suffix can not be changed).

I think the Beast Recipe might be coded in a way that it tries to change the item, instead of adding.

Item I tried it with:

Copy/Paste of item description:
Spoiler
Item Class: Shields
Rarity: Rare
Carrion Call
Harmonic Spirit Shield
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Quality: +30% (augmented)
Chance to Block: 23%
Energy Shield: 86 (augmented)
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Requirements:
Level: 65
Int: 159
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Sockets: B-B-R
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Item Level: 85
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15% increased Spell Damage (implicit)
Item sells for much more to vendors (implicit)
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Socketed Gems have 20% increased Reservation Efficiency
+1 to Level of all Physical Spell Skill Gems
Prefixes Cannot Be Changed (crafted)
Can have up to 3 Crafted Modifiers (crafted)
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Shaper Item
Last bumped on Apr 19, 2023, 3:14:26 AM
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do you know if that was fixed in any way?
Thanks for your report, I'll pass this on.

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