Kernel snaps built on LP are missing the modules.[alias|alias.bin|builtin.bin|dep|dep.bin|etcetc] files

Since last week (though i'm not sure when it started...), all kernel snaps built on LP are missing the 'modules.*' files.

In particular, the same kernel snap, built locally vs built on LP, is missing these files:

$ diff -du localbuilt.list lpbuilt.list
@@ -6925,16 +6925,7 @@
 modules/4.4.83+/kernel/virt
 modules/4.4.83+/kernel/virt/lib
 modules/4.4.83+/kernel/virt/lib/irqbypass.ko
-modules/4.4.83+/modules.alias
-modules/4.4.83+/modules.alias.bin
 modules/4.4.83+/modules.builtin
-modules/4.4.83+/modules.builtin.bin
-modules/4.4.83+/modules.dep
-modules/4.4.83+/modules.dep.bin
-modules/4.4.83+/modules.devname
 modules/4.4.83+/modules.order
-modules/4.4.83+/modules.softdep
-modules/4.4.83+/modules.symbols
-modules/4.4.83+/modules.symbols.bin
 modules/4.4.83+/source
 System.map-4.4.83+

And obviously, the resulting kernel, even if it ships with all the kmods, it won't load a single kernel module when booted up on the target hardware.

To reproduce the problem:
- git clone the Xenial kernel tree

$ git clone git://git.launchpad.net/~ubuntu-kernel/ubuntu/+source/linux/+git/xenial

- and build the generic kernel snap locally:

$ cd xenial
$ snapcraft

- then push the same tree to LP, create a snap package, build it and compare the contect vs the locally built one - you will notice the above files are missing.