I have Minecraft Dungeons with all the DLC on both PC and Xbox Series X.  I upload my characters regularly to switch between pc and xbox.

In regards to the Ender Eyes issue I am having, the first Ender mission I completed was Highblock Halls, I was at 1/6 eyes.

I uploaded my character from my Xbox to PC.  I had to reinstall my copy of MD on PC because Echoing Void would not show up as purchased on PC until I reinstalled the game.

After I reinstalled the game I noticed that I was down to 0/6 eyes.  I have now completed all the other missions which has got me to 5/6 ender eyes.  It shows the final mission that I need to complete is Highblock Halls.  Each time I complete Highblock halls, the ender does not drop. 

There is some kind of glitch that the game believes I have completed HIghblock Halls therefor wont drop another eye for me, but still shows on the map as uncompleted.

I can't progress the stronghold until I get 6/6 eyes, so please fix this bug.