RE: I have seen this error frequently in the forum
An update which addresses this warning was released earlier today, please navigate to the WordPress Plugins admin page and update to 8.36.1.
Once in a great while testing does not cover a scenario in which an warning might be issued by PHP makes thru to release. A quick search of the forums shows about 20 instances over roughly 5 years with most posts being from multiple users for the same occurrence.
I do my best to make sure that none ever slip through but it does happen. I apologize for the trouble and inconvenience this has caused you!
The best solution to ensure PHP errors and warnings are not displayed publicly. This is considered to be a best practice for live websites.
Here’s a link to a tutorial which you can use to ensure these are not publicly displayed:
Hope this helps! Again, apologies for the trouble!