Start worldserver.exe from cmd/powershell (no double-clicking on worldserver.exe) and check what gets printed before it closes.
While at it, run ".server info" and post the output.
MySQL 5.7.25 works fine for me, you just need to rebuild worldserver to use latest library after the upgrade (that's probably the incompatibility message you received)
I've been using http://valgrind.org/ for years and I'm getting curious about ASan, do you have experience with the tool or did you just gave it a try ?
Could you try running master with valgrind too ?
Thanks
You can also add the remote repo where the pull request is and then merge it into the local TC branch (3.3.5 or master). It will be up to you to deal with merge conflicts and updates tho (probably requiring to rebase from time to time).