Don't ask me why, but somehow I had this site that ended up with one of the gutenberg tags having bad JSON in their attributes. This makes the site crash when you save a node. Which is kind of unnecessary. So regardless of whether that bad data is there or not, we should still make it possible to at least save things, and not crash.
Looking at it more, the wordpress block parser class seems to have the exact same issue, so I will try to report and fix the bug there as well.
See attached tests
Ensure we are creating objects with the expected parameter types when they come from user input being parsed into data structures
Needs review
3.0
Code
Here is a link to a failing test, for convenience. The MR now passes its own tests
https://git.drupalcode.org/project/gutenberg/-/jobs/2576661
now to try to figure out if I can contribute the fix to wordpress