Crucible shield mod gets removed after editing the item

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What is the behaviour in-game?

N/A

What is the behaviour in Path of Building?

I have a shield in PoB where I edit and add the crucible more for 3% chance to block spell damage/5% more maximum mana and save the item.

If I edit the item again the mod is still shown correctly, but if I click add crucible mod I see only the 3% chance to block spell damage attribute. After I edit a different crucible mod and go to save the item, I can see that it is applying just the spell block mod (showing a ~5% mana loss).

Shields do have a 3% spell block node so maybe PoB is reverting to the other T2 node.

How to reproduce the issue

1. Create a shield
2. Add the crucible mod for spell block/more mana
3. Save the item
4. Edit the item
5. Add any other crucible mod
6. Save the item
7. Note the removal of the more mana mod (spell block is retained)

Character build code

https://pastebin.com/Bu8u4JH8

Screenshots

No response

Reproduce the issue in the item editor using the provided build code, following the listed steps with a shield and the Crucible spell-block/more-mana mod. Trace the save and reload path for Crucible mods; the fix is complete when editing another Crucible mod no longer removes the more-mana modifier while retaining spell block.