Ah.  In /lib/udev/rules.d/50-udev-default.rules:

  KERNEL=="fuse", ACTION=="add",  MODE="0666",
OPTIONS+="static_node=fuse"

So most udev rules apply MODE settings unconditionally, but the fuse
rule for some reason applies permissions only for ACTION==add.  That
means that when we rescan with --action=change, this device gets the
default device permissions applied instead of the ones intended for
/dev/fuse.

I think the correct fix here is to drop the 'ACTION=="add"', but this
should be checked with upstream to be sure.

As for rfkill, I don't see what's causing the permission change.  It may
be an adverse interaction with udev-acl, I'm not sure.

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https://bugs.launchpad.net/bugs/1152718

Title:
  udevadm seems to set incorrect permissions for /dev/fuse

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