Mojave iCloud Keychain Copy & Paste Error I am trying to copy iCloud web form passwords to a local keychain as per this tutorial.

However, I keep on getting the following error. 


Text:

An error has occurred. Unable to add an item to the current keychain.

One o more parameters passed to a function were not valid.

[Cancel]                                     [   Ok   ]


When copying and pasting from login, it works successfully so the problem must be related to iCloud Keychains.

Other people have encountered this problem:


Can't copy-and-paste in Mojave keychain
Error when running security in Terminal


but most interesting is this post


One or more parameters passed to a function were not valid. in unlock login.keychain
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Update:

Contacted Apple Support. They couldn't figure out so an engineer is gonna take a look at log files.
Engineer responded with something like &quot;While third parties may support exporting from iCloud and previous versions may support it, current macOS versions doesn't support it by default. But it maybe supported in future.&quot;.
Based on how low level the error message is, I suspect that this feature was broken unintentionally and Apple is just too lazy to fix it. I interpret the engineer's statement as something to the effect of &quot;Oops, we broke some really useful thing that some people used, and we are too lazy to fix it so I am just gonna say its not supported anymore, but give a cushion of 'we may support in the future' incase someone complains enough and we do decide to put it back in.&quot;.
Pretty annoyed tbh. It appears...
Due to Apples special encryption method used for iCloud keychains, it is nearly impossible for a third party to decrypt it, even with the password and due to whatever reason, Apple has stopped supported exporting to local keychain, which can be decrypted by third parties.
After looking more into it, the entire implementation seems to be open source. If anyone with the skill would like to take the time to figure out how to decrypt it, that'd be pretty cool. Here's the links:
https://opensource.apple.com/tarballs/Security/
https://opensource.apple.com/source/Security/