Yes, in fact, it does not work with 7.2. My problem is that I run Memberium as well and it requires IonCube. WPEngine is not running IonCube with PHP 7.3 and I was told they don’t plan to. Not sure how that will work out for them.
Hopefully, there will be a patch so that All-in-One Event Calendar will run with PHP 7.2.
For those with Similar problems, WPX is running IonCube 10.3.9 with PHP 7.3
I have that same issue re: WPE, 7.3 and IonCube as I build Memberium sites. I’ve been told via reliable sources that the fix on the Memberium side is in progress, but there is not a firm resolution date yet.