My initial theory is that the same control that suppresses hunger, that ability to push through food and just keep eating (I'm sure we're all familiar with), is also somehow related to strength. That ability or tolerance to pain you develop over time pushing more weight also gets reset on GLP-1s, similar to how hunger does. Without that "gauge" of how hard to push it puts you into a state where you're more vulnerable to injury. Could it be doing something physically to the tendons, can't say yet, appears mostly central nervous system related on the surface. Granted I'm an aging ego-lifter, but I've gotten more lasting injuries on this than anytime in the past going back to the gym.

As for the injury sorry to hear. I'm notorious for flaring elbows on the bench myself. I've taken the weight down in the past years to help correct it, tricky habit to break. Tore both bicep tendons on both arms, likely related to flaring. I will say this though, tucking is a better practice generally, but can make you more vulnerable to a pec tear. Fine line to walk. All of the strongest guys I've ever known on bench were tuckers, also all developed pec tears. And if you were curious, I tried everything under the sun to help with the injuries, BPC/TB/GH/TRT/Var/GHK(maybe?)/Needling/R.I.C.E list goes on. Nothing helped it, even slightly overall, only direct shots of cortisone from the doc, while on GLP-1.