Publishing a post with beneficiary with Keychain Chrome extension results in an error

Steps to replicate:

• Login with Keychain
• Create a new post
• Add a beneficiary (example 100% to @hbdstabilizer)
• Submit
• Approve the operation in Keychain popup

Expected:

It should continue and publish the post and update the page.

Actual:

There is an error showing inside the Keychain popup saying that it could not serialise the payload.

Here are some logs from the Keychain popup: