I dont have github account and i tried to register a github account but captcha always blocked me, so i'm here to feedback this issue.
Before blockbench 4.12.6, copy group will also copy all cubes included texture, but after 5.0.0 version of blockbench, copy group will only copy cubes(same size, angles, position, UV resize) but misson textures, as i mentioned image, will losing quartz_block_bottom.png, this issue only happen when copy group, if directly copy cube will nothing happen, texture will normally copied for cube.
This issue very important for me and will effect very lots of people because it will cause all large model making more difficult, hope blockbench team can fix this issue in next release thanks!
Version: 5.0.2
Platform: Web App & Linux Appimage package