First portal into nether worked perfectly and has for weeks. Found a distant nether fortress and decide to build a portal back to overworld, and this portal crashes every time. Have tried restarting, and rebuilding the portal to try again. Each time, the transport animation plays, but just as the box, which typically says "building world...", begins to display the game crashes to desktop. I saw there were similar issues which were resolved previously, but nothing documented on the 1.17.11 version. 

This is on world seed -2005828633 and the coordinates of the portal's bottom center block, in the nether, are (59,61,407).