PKS 1.5's Windows support defines the minimum required Windows stemcell as version 2019.7, however if you provide a greater version (eg 2019.8), cluster creation will fail. Full details of this bug are detailed in this Tracker story.
The root of the problem was that the PKS service adapter had 2019.7
hardcoded and therefore always would try to deploy that stemcell when deploying Windows clusters.
On-demand service broker (ODB) does not allow using latest
for stemcell version, so we had to find a way to send the currently uploaded Windows stemcell version from OpsManager to the broker. The Linux stemcell version was always passed using the [tile metadata](https://github.com/pivotal-cf/p-pks-integrations/blob/a705ebb3bb52b808a70dca1540d1c4aab77fe1e6/insta