When clicking the "Open Pack Folder" button in the Resource Pack menu, It open Dolphin (File Manager for Linux) and freeze the game until i close Dolphin.

Same thing when i click the name of the screenshot ("Saved screenshot as xxxx.png") after taking a screenshot, the game freeze until I close my image viewer.

Doesn't happen when I click a link like the "Report Bugs" button.

F3 + P don't change anything, i think the problem is that minecraft wait for the process to finish

if I open to LAN my world and make the game freeze, i can connect to the LAN world but can't interact with my first account, video for illustration

even if I don't open my world to LAN, the server continue to play, video for illustration

The bug seem to start on 17w43a