So this turned into a problem. I went in to capture the error and saw that it gave the error about unable to read the background color, as I guess that was applied to the taxonomy term so that the text would stand out more.
I cleared the background color on the taxonomy term block and added #ffffff, however when I clicked save it would not save. So I clicked on the three dots to the right of the taxonomy block in the block navigator and clicked on delete block with the idea to add it back in without a background color. At this point the page crashed.
I refreshed the page to try again and the server gave a 503 error and the server is not responsive any more. I checked the logs and see a huge number of Cwicly heartbeat errors. I’ve reached out to server support to see about restarting the server.
This sounds very unusual to me, as a block crash should not lead to a page/server crash.
Your not being able to save the page would confirm that you were experiencing issues before making the background change.
I will also add that the heartbeat errors are most likely due to a locale error due to the use of the native wp.api functions, which is out of our hands currently. I highly doubt this has any link to the issue you’re experiencing.
I’d be grateful if you could send some login details to the team at email@example.com so we can take a look at this.