I last went through the US Pre-clearance process in Dublin Airport on New Year's Eve 2023. It seems like they have changed the part where everyone needs to go through a TSA style security screening before CBP.
Typically, the Americans require a secondary security check as part of the Pre-clearance process, after which everyone goes through Customs and Immigration (and Global Entry, if eligible), and then the final departure lounge. But now, a significant portion of passengers get to bypass the Pre-clearance security, with some others still going through the old process.
After reading through some forums and articles, it looks like there has been a trial going on, where outbound Dublin passengers are generally given waivers for the TSA security screening, with connecting passengers and possibly SSSS selectees (if they even do this, nowadays) needing to get checked for a second time before CBP.
Sources:
https://www.tripadvisor.com/ShowTopic-g1-i10702-k14363184-US_pre_clearance_Dublin-Air_Travel.html
https://www.turningleftforless.com/reader-review-dublin-airport-us-pre-clearance-and-american-airlines-b777/
https://www.flyertalk.com/forum/aer-lingus-aerclub/2087220-dublin-tsa-screening-pre-clearance-3.html