Well, there is only 10 places in Connections where
wp_list_pluck() is used. Only 8 of those that have the param set for index key to
name. Of those 8, only 2 even have the opportunity to run unless you are on the Connections : Tools admin page because that file that contains those instances are only included in the file for that page when you are actually on that page. The remaining 2, one is a validation function. That validation function is only ever used on Connections : Tools admin page. So that last one is the only possibility and that can only happen if the
class.log-email.php file does not exist. And if that file did not exist Connections would crash causing PHP to crash.
Can you check this path to see if that the file is not empty?
If it is empty, then WordPress failed to install the update. It’s rare but can happen. If that is the case, I suggest deleting and reinstalling Connections.
If it is not empty, please go to the Connections : Tools admin page and click the Logs tag. The top drop down should have two options, System Email and System Info Email. Does it have those two?
If it does, go to the System Info tab and send yourself a copy of the system info. After you do, go back to the Logs tabs. Does that email show in the log?
There is no known issues with this update. In 8.3 there was an issue that would affect only those whose host is still running a very, very old version of PHP, that was corrected in the 8.3.1 release which is the version you updated to.
I fully expect some rare edge case bugs, seems there always are due to the wide diversity of hardware and software versions. So maybe we’ve stumbled on to one of those. But so far the success rate of updated for 8.3.x is in the ballpark of 99.998% which is pretty good.
Any way please share that link with me and I’ll take a look as soon as possible.