container cap not honored

- [ ] docker-plugin version you use
1.2.2

- [ ] jenkins version you use
2.263.3

- [ ] docker engine version you use
19.03.12

- [ ] details of the docker container(s) involved and details of how the docker-plugin is connecting to them
not relevant.

- [ ] stack trace / logs / any technical details that could help diagnose this issue
all images and explanations are already [here](https://issues.jenkins.io/browse/JENKINS-64033).

bottom line - the container cap value I set in the docker cloud is not being honored by the plugin.
I'm creating a simple pipeline job which only start a dockerNode with some image, and in then sleeps for 100 seconds.
no matter how many docker "clouds" I define, and no matter what is the value I set in the container cap - it is not honored. all the containers are created on the first docker cloud defined.

I would expect a spread of the images, or at least not creating more the allowed value of containers on the same cloud.

more information can be provided upon request.