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#216 [fillbetween] (or softclip) breaks " \@"

v1.0 (example)
open
nobody
fillbetween (19)
5
2019-01-29
2018-12-25
Benjamin Desef
No

Consider the following MWE:

\documentclass{article}

\usepackage{pgfplots}
\usepgfplotslibrary{fillbetween}

\begin{document}
   a\@ b
\end{document}

If the fillbetween library is included, the \@-command suddenly eats up the following space, so that "ab" is printed instead of "a b", as it normally should be the case. The problem also occurs if instead of fillbetween you load decorations.softclip. At first sight, the latter library does nothing else than loading the corresponding tikz library of the same name. Interestingly, if I instead load decorations.softclip via \usetikzlibrary, the problem is not present. And furthermore, the definition of \@ seems to stay unchanged at all times.
Without the libraries, I have

....\TU/lmr/m/n/10 a
....\glue(\spaceskip) 3.33 plus 1.665 minus 1.11
....\TU/lmr/m/n/10 b

and with, the glue is completely missing.

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