completed end portal but portal not spawning

my end portal is complete, it’s a portal I’ve used for over a year. the ender dragon was killed. despite previously beating the dragon and having used the portal many times, the portal is complete but there is no longer a portal. I recently updated to v26.2 the issue still is still occurring. I tried filling in 2 other end portal frames, it made the noise but no portal appeared. please fix this so i can continue to go to the end dimension