Spurious shifting of headline when conditionally placing logo on beamer slide using pgfputat

I have a macro taken from this question that places a logo on all frames following placelogotrue and on no frame following placelogofalse. It largely works as intended, but it causes headline and foodline of the frames with the logo to be slightly shifted to the left, leaving some spurious whitespace (compare the upper image footline with the lower image headline in the pictures below):

Here’s the code to reproduce:

% !TeX program = lualatex
documentclass{beamer}

usetheme{Malmoe}
% graphics
DeclareGraphicsExtensions{.jpg,.jpeg,.png,.pdf}

% TikZ/PGF
usepackage{pgf}

% customization of beamer style
setbeamertemplate{bibliography item}{}
setbeamertemplate{navigation symbols}{}

% define logo
newififplacelogo
placelogotrue
logo{ifplacelogopgfputat{pgfxy(-0.1,7.72)}{pgfbox[right,base]{%
            includegraphics[height=7mm]{example-image-a}
    }}fi}%

% define custom headline
setbeamertemplate{headline}
{%
    leavevmode%
    begin{beamercolorbox}[wd=.5paperwidth,ht=2.5ex,dp=1.125ex]{section in head/foot}%
        hbox to .5paperwidth{hfilinsertsectionheadhfil}
    end{beamercolorbox}%
    begin{beamercolorbox}[wd=.5paperwidth,ht=2.5ex,dp=1.125ex]{subsection in head/foot}%
        hbox to .5paperwidth{hfilinsertsubsectionheadhfil}
    end{beamercolorbox}%
}

begin{document}

begin{frame}
end{frame}

placelogofalse
begin{frame}
end{frame}


end{document}

Why is that? I would have expected pgfputat not to alter spacing on the frame at all…

I’m compiling with LuaLaTeX Version 1.12.0 (TeX Live 2020) on Arch Linux.