Trialmaster's Tower unseal button disappeared

Encountered a bug where the 'unseal' button on the Trialmaster's Tower door disappeared when I used Alt+Tab.

I was in Fullscreen and used Alt+Tab to pause a video I had playing on my second screen. The last fate fragment had been put in a previous run where I also used Alt+Tab before going to open the door and having the same problem.

And the game crashed upon defeating the Trialmaster on the next run...

Same here, all 3 fragments were consumed and couldn't be recovered, and the button the unlock the tower disappeared.

Hey for anyone experiencing this issue what you can do is portal out, change your window mode to windowed fullscreen / windowed then teleport back and put your game back to fullscreen. The unseal button should now appear once more. Good luck exiles!

I just left and came back and the button reappeared.