Im looking to mount partitions by label on a reinstall with <initialize> set to false. But the below configuration fails with 'Error while configuring partitions. Try again.'. The logs don't show anything either. Is there a way I can mountby label in the post-partition or post section to get this working?

<partitioning config:type="list">
<drive>
<device>/dev/sda</device>
<initialize config:type="boolean">false</initialize>
<partitions config:type="list">
<partition>
<create config:type="boolean">false</create>
<format config:type="boolean">true</format>
<mount>/</mount>
<partition_id config:type="integer">131</partition_id>
<filesystem config:type="symbol">ext3</filesystem>
<mountby config:type="symbol">label</mountby>
<partition_type>primary</partition_type>
</partition>
<partition>
<create config:type="boolean">false</create>
<format config:type="boolean">true</format>
<mount>/var</mount>
<partition_id config:type="integer">131</partition_id>
<filesystem config:type="symbol">ext3</filesystem>
<mountby config:type="symbol">label</mountby>
</partition>
<partition>
<create config:type="boolean">false</create>
<format config:type="boolean">true</format>
<mount>swap</mount>
<partition_id config:type="integer">130</partition_id>
<filesystem config:type="symbol">swap</filesystem>
<mountby config:type="symbol">label</mountby>
</partition>
</partitions>
</drive>
</partitioning>