Puppet won't install (some) packages with ensure => held

Puppet Version: 6.9.0-1bionic
Puppet Server Version: 6.2.0-1bionic
OS Name/Version: Ubuntu 18.04

I have postfix and installed and held:

package { 'postfix':

 ensure => 'held',

}

# dpkg -l | grep postfix

hi postfix 3.3.0-1ubuntu0.2 amd64 High-performance mail transport agent

Now I'm trying to install a few sub-packages, also as held:

$packages = [

 'postfix-pcre',

 'postfix-mysql',

]

package { $packages:

 ensure => 'held',

}

When running puppet, the following messages are displayed:

Notice: /Stage[main]/Main/Package[postfix-pcre]/ensure: created
Notice: /Stage[main]/Main/Package[postfix-mysql]/ensure: created

Desired Behavior:

**Packages postfix-pcre and postfix-mysql should be installed and set to "held".

Actual Behavior:

Neither package is installed. The puppet resource command results in a package resource with ensure set to "purged":

# puppet resource package postfix-mysql ensure=held

Notice: /Package[postfix-mysql]/ensure: created

package { 'postfix-mysql':

 ensure => 'purged',

 provider => 'apt',

}

 This seems to only affect sub-packages like in this Postfix example; I have other packages set to ensure => held which have been installed properly.