Error updating the community "About" section.

I am trying to put in a short blurb in the About section of /env, but get an error on the specific phrase "If you care about climate news, environment protection and sustainable technology, please join the conversation!"

The error just says "Failed to update community. Please try again."

The fun part is that parts of the sentence work fine. Both the first and second half can be set individually, so it's not a word filter. Some permutations of the blurb work. Others don't.

"If you care about climate news, environment protection and sustainable technology, please join us!" - One extra word, doesn't work.
"If you care about climate news, environment protection and sustainable technology, join the conversation!" - Nope.

"If you care about climate news, environment protection and sustainable technology, join us!" - That works.

I've tried other things, some work, some don't, but I haven't noticed a pattern.

Editing the name and guidelines, adding the icon and cover image all works fine.

On that note, after the error occurred, the form can not be submitted again.