"Publishing failed. Error message: Could not update post in the database" caused by encoding

[1000camels]

I have some text that I am copying into the title of a post. I get the following error:

"Publishing failed. Error message: Could not update post in the database"

The text is:

𝐀 𝐖𝐢𝐧 𝐟𝐨𝐫 𝐚 𝐉𝐮𝐬𝐭𝐢𝐜𝐞 𝐂𝐞𝐧𝐭𝐫𝐞 𝐂𝐥𝐢𝐞𝐧𝐭!

I am having trouble understanding what encoding this text is.

Why is this failing to save to the database? My database is set to utf8mb4. Why WordPress is choking on it?

[noisysocks]

I created a post with 𝐀 𝐖𝐢𝐧 𝐟𝐨𝐫 𝐚 𝐉𝐮𝐬𝐭𝐢𝐜𝐞 𝐂𝐞𝐧𝐭𝐫𝐞 𝐂𝐥𝐢𝐞𝐧𝐭! as the title and was able to publish it. The post_title looked correct when I looked at the post in phpMyAdmin.

I was not, however, able to preview or view the post. I got a 404 error. It looks like the post_name is URL escaped and that WordPress is choking on finding the post by its slug.

[Presskopp]

Works for me using the block editor aka Gutenberg and the classic editor as well. Only the slug is shortened to 𝐀-𝐖𝐢𝐧-𝐟𝐨𝐫-𝐚-𝐉𝐮𝐬𝐭𝐢𝐜𝐞-𝐂/ in both cases