I had never used the custom feature before 23.01, so I don't know if it had worked previously or not. If not, then a blank end date defaulting to "now", or an option to select "now, would be a nice enhancement.
I spent last Fall updating an entire website from PHP 7.4 to 8.1, a month of tedium trying things, looking at the syslogs, fix, try again, etc. What a pain... I am still finding PHP warnings and deprecations in my logs that I have to chase.