After upgrading Jenkins and the Docker build step plugin to the latest version, the output presented in the console log has a lot of garbage in it. Example text below:

Docker] INFO: BuildResponseItem[stream=Step 1/11 : FROM ruby:2.3.3
,status=<null>,progressDetail=<null>,progress=<null>,id=<null>,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]
[Docker] INFO: BuildResponseItem[stream= ---> e61934e8d871
,status=<null>,progressDetail=<null>,progress=<null>,id=<null>,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]
[Docker] INFO: BuildResponseItem[stream=Step 2/11 : RUN apt-get update -qq && apt-get install -y build-essential libmysqlclient-dev nodejs imagemagick && apt-get clean && rm -rf /var/lib/apt/lists/*
,status=<null>,progressDetail=<null>,progress=<null>,id=<null>,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]
[Docker] INFO: BuildResponseItem[stream= ---> Using cache
,status=<null>,progressDetail=<null>,progress=<null>,id=<null>,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]
[Docker] INFO: BuildResponseItem[stream= ---> f9c752bec7be
,status=<null>,progressDetail=<null>,progress=<null>,id=<null>,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]
[Docker] INFO: BuildResponseItem[stream=Step 3/11 : RUN echo America/New_York > /etc/timezone && dpkg-reconfigure --frontend noninteractive tzdata
,status=<null>,progressDetail=<null>,progress=<null>,id=<null>,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]
[Docker] INFO: BuildResponseItem[stream= ---> Using cache
,status=<null>,progressDetail=<null>,progress=<null>,id=<null>,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]
[Docker] INFO: BuildResponseItem[stream= ---> 60052b9487a2
,status=<null>,progressDetail=<null>,progress=<null>,id=<null>,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]

This also appears in the logs for pushing:

[Docker] INFO: PushResponseItem[stream=<null>,status=Pushing,progressDetail=ResponseItem.ProgressDetail[current=130428561,total=240472754,start=<null>],progress=[===========================> ] 130.4MB/240.5MB,id=1dc1a0a1937a,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]
[Docker] INFO: PushResponseItem[stream=<null>,status=Pushing,progressDetail=ResponseItem.ProgressDetail[current=132014642,total=240472754,start=<null>],progress=[===========================> ] 132MB/240.5MB,id=1dc1a0a1937a,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]
[Docker] INFO: PushResponseItem[stream=<null>,status=Pushing,progressDetail=ResponseItem.ProgressDetail[current=133590247,total=240472754,start=<null>],progress=[===========================> ] 133.6MB/240.5MB,id=1dc1a0a1937a,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]
[Docker] INFO: PushResponseItem[stream=<null>,status=Pushing,progressDetail=ResponseItem.ProgressDetail[current=135165405,total=240472754,start=<null>],progress=[============================> ] 135.2MB/240.5MB,id=1dc1a0a1937a,from=<null>,time=<null>,errorDetail=<null>,error=<null>,aux=<null>]