Same thing for me when I place a bunch in a row some stay some go back into my inventory
Problem still persists, Olli's temporary solution of not opening the launcher with internet works, however there are some issues with ghost Minecraft applications running and requiring force quit via activity monitor.
Same issue here on a 2012 Mac Book Pro, (macOS Sierra 10.12.6), unable to open Minecraft launcher and failure to load the NativeUpdater. Yesterday was fine, but reloading Minecraft Launcher killed it.
Uninstalled, and reinstalled, deleted, still nothing. Tried opening from launcher.exec, but still had problems. Updated Java, and still ain't working. Launcher doesn't stay in activity monitor long enough for it to be forced stopped.
Rolling back launcher or providing static pre-update launcher would be great.
Same here doesn’t work in IPad and ps5