Different outputs for documents built on different Texlive versions

With this minimal example:

documentclass{article}
usepackage{parskip}
usepackage{titlesec}

titlespacing*{section}{0pt}{1ex plus .2ex minus 0.1ex}{1ex plus .2ex minus 0.1ex}
titlespacing*{subsection}{0pt}{1ex plus .2ex minus 0.1ex}{1ex plus .2ex minus 0.1ex}

begin{document}
section{Foo}
Lorem.
subsection{Foobar}
Ipsum.
section{Bar}
Dolor.
end{document}

I don’t get the same output with two different Docker images. With one build the spacings before and after the titles are bigger. I am using these two docker images. I noticed the issue when my CI generated a 3 pages document when I was generating a 2 pages document locally.

$ docker images --digests | grep nowox/latex
nowox/latex 1.0    sha256:4743340934972f31e0bbfaeafda1202c0c94f442251595c9c91f83a7aa02bd5f 2 weeks ago    1.9GB
nowox/latex <none> sha256:252e2811d18e8b69dbe036a789c109cbfa72e4a9397eaa84e07fb0cc12cdc10d 12 months ago  2.43GB

To run LaTeX I use :

docker run -v$(pwd)/home -w/home <image-id> xelatex test.tex

Is there an issue with my way of setting the spacing or is there an issue with these packages?

Here the listfiles for the latter version:

$ docker run -v$(pwd):/home -w/home 019287608dc1 xelatex tutu.tex
This is XeTeX, Version 3.14159265-2.6-0.999991 (TeX Live 2019/Debian) 
 restricted write18 enabled.
entering extended mode

LaTeX2e <2018-12-01>
...
 *File List*
 article.cls    2018/09/03 v1.4i Standard LaTeX document class
  size10.clo    2018/09/03 v1.4i Standard LaTeX file (size option)
titlesec.sty    2016/03/21 v2.10.2 Sectioning titles
 parskip.sty    2019-01-16 v2.0c non-zero parskip adjustments
kvoptions.sty    2016/05/16 v3.12 Key value format for package options (HO)
  keyval.sty    2014/10/28 v1.15 key=value parser (DPC)
 ltxcmds.sty    2016/05/16 v1.23 LaTeX kernel commands for general use (HO)
kvsetkeys.sty    2016/05/16 v1.17 Key value parser (HO)
infwarerr.sty    2016/05/16 v1.4 Providing info/warning/error messages (HO)
etexcmds.sty    2016/05/16 v1.6 Avoid name clashes with e-TeX commands (HO)
ifluatex.sty    2016/05/16 v1.4 Provides the ifluatex switch (HO)
etoolbox.sty    2018/08/19 v2.5f e-TeX tools for LaTeX (JAW)
 ***********

The the output for the former one:

$ docker run -v$(pwd):/home -w/home 2d2b58e23f53 xelatex tutu.tex
This is XeTeX, Version 3.14159265-2.6-0.99998 (TeX Live 2017/Debian) 
 restricted write18 enabled.
entering extended mode

LaTeX2e <2017-04-15>
...    
 *File List*
 article.cls    2014/09/29 v1.4h Standard LaTeX document class
  size10.clo    2014/09/29 v1.4h Standard LaTeX file (size option)
titlesec.sty    2016/03/21 v2.10.2 Sectioning titles
 parskip.sty    2001/04/09 non-zero parskip adjustments
 ***********

I realized I made a change to my Dockerfile without changing its tag, so the latter version has this Dockerfile:

FROM ubuntu:bionic
LABEL maintainer="Yves Chevallier <[email protected]>"

ARG DEBIAN_FRONTEND=noninteractive
RUN apt-get update
RUN apt-get install -y make
RUN apt-get install -y texlive-xetex
RUN apt-get install -y texlive-lang-french
RUN apt-get install -y texlive-fonts-extra
RUN apt-get install -y latexmk

RUN rm -rf /var/lib/apt/lists/*
ENV USER=latex

And I think the former one should differ only by the version of ubuntu used.

usepackage{parskip}[=v1]