When I generate the Jenkins JSON instead of geting the 'spotConfig' subsection I get. This only happens when I enable the spot instance config on a given Agent. This happens with both Linux and Windows agent types.
This happens both when I enable the 'Set bid price' tick box and when I leave it disabled.
This happens if the 'Spot Block Reservation Duration' is set or unset.
Spot Block Reservation Duration

Repo steps:

• Install both plugins.
• Setup an EC2 Agent.
• Enable 'Use Spot Instance' tick box
• Add a 'Spot Block Reservation Duration' (I have used 0 and 1 values, both show the issue).

Exception:

FAILED TO EXPORT
hudson.plugins.ec2.SlaveTemplate#spotConfig: io.jenkins.plugins.casc.ConfiguratorException: Can't read attribute 'spotBlockReservationDurationStr' from hudson.plugins.ec2.SpotConfiguration@290b6a
at io.jenkins.plugins.casc.Attribute._getValue(Attribute.java:392)
at io.jenkins.plugins.casc.Attribute.getValue(Attribute.java:214)
at io.jenkins.plugins.casc.impl.configurators.DataBoundConfigurator.describe(DataBoundConfigurator.java:283)
at io.jenkins.plugins.casc.Attribute._describe(Attribute.java:260)
at io.jenkins.plugins.casc.Attribute.describe(Attribute.java:239)
at io.jenkins.plugins.casc.impl.configurators.DataBoundConfigurator.describe(DataBoundConfigurator.java:309)
at io.jenkins.plugins.casc.Attribute._describe(Attribute.java:260)
at io.jenkins.plugins.casc.Attribute.describe(Attribute.java:235)
at io.jenkins.plugins.casc.impl.configurators.DataBoundConfigurator.describe(DataBoundConfigurator.java:309)
at io.jenkins.plugins.casc.impl.configurators.HeteroDescribableConfigurator.lambda$convertToNode$de0cd4f8$1(HeteroDescribableConfigurator.java:283)
at io.vavr.CheckedFunction0.lambda$unchecked$52349c75$1(CheckedFunction0.java:201)
at io.jenkins.plugins.casc.impl.configurators.HeteroDescribableConfigurator.convertToNode(HeteroDescribableConfigurator.java:283)
at io.jenkins.plugins.casc.impl.configurators.HeteroDescribableConfigurator.lambda$describe$5(HeteroDescribableConfigurator.java:107)
at io.vavr.control.Option.map(Option.java:373)
at io.jenkins.plugins.casc.impl.configurators.HeteroDescribableConfigurator.describe(HeteroDescribableConfigurator.java:107)
at io.jenkins.plugins.casc.impl.configurators.HeteroDescribableConfigurator.describe(HeteroDescribableConfigurator.java:55)
at io.jenkins.plugins.casc.Attribute._describe(Attribute.java:260)
at io.jenkins.plugins.casc.Attribute.describe(Attribute.java:235)
at io.jenkins.plugins.casc.Configurator.describe(Configurator.java:161)