Today, I started seeing this error. I'm not certain if it's my issue or MB. Strange thing is that it only happens on one host. (I have the same site duplicated on several hosts. On local server and DreamHost there is no error. But on Flywheel the error just appeared.)
Notice: Trying to access array offset on value of type bool in /www/wp-content/plugins/meta-box-aio/vendor/meta-box/text-limiter/text-limiter.php on line 77
Screenshot of error in browser: https://cln.sh/AMTKzR
If you need more information from me, please let me know.