By default it uses @nx-bun/nx plugin to create bun apps and libs
I've added a patch for the nx library to add bun package manager into NX
Currently have two PR solutions for Bun package manager in NX: nrwl/nx#15622 nrwl/nx#19113
Any issues is likelly with patch or @nx-bun. Please raise a issue in @nx-bun/nx first as its the main repo and contains the patch work too.