Apparently this bug only affects HD texture packs of which there are just 2.
https://twitter.com/ChromaHills/status/1017067801088004097
EDIT: Yup, still happening in 1.6.0.5 just not the same way. Sometimes it remembers for up to 10 launch and quits, then sometimes it forgets just like in 1.4.2/1.6.0.1
Still testing here, but it would appear to be fixed in 1.6.0.5 on Windows 10 PC. Launched and quit the game 10 times and it has remembered my global textures. Gone into and out of several maps with different textures packs and when coming back the main menu, my chosen global pack is still there! 🙂
This (for me) only affects the Global settings, packs I assign to individual worlds are 100% fine.
(Windows 10 PC)
Launch the game, wait for xbox sign-in, go to Settings/Global Resources and activate my selected pack (Natural Texture Pack by Microsoft) (pack validation is error free), go back to main menu and pack is now activated and working fine.
Do nothing but go back to the main menu, shutdown the game, launch the game, pack is still active, do nothing at all, shutdown the game again.
Launch game and pack has been forgotten. This happens very time no matter which pack I use.
Tested in 1.4.2 and in the beta 1.6.0.1 both do it.
Still not fixed in the current Beta (1.6.0.1) on Windows 10 PC. I did the usual test, break all the big beans off the jungle wood logs and placed new. Bug still there. Created a new world, went looking for a jungle, found massive coco beans.
I can understand skipping/missing some obscure bugs, but this a smack you in the face obvious bug that should be easy to fix.
My public IP has been 160.226.249.XXX for the last 11 months and this auth/session issue has only started happening a few days ago for me. So....???
... actually this bug seems to affect any texture pack above 16x16.