0. Two nodes of label 'X32' configured as "number of executors"=1
1. Create a "free-style software project", tie it to 'X32' label.
Run this job twice - two builds will be run simultaneously, both nodes are used. It is OK.
2. Create a "multi-configuration project", tie it to 'X32' label.
Run this job twice - one build started and running, another job is in queue, only one node is used.