XeLaTeX "Missing character: There is no (U+0020) in font [academicons.ttf]:!"

[lamBOOO]

When using XeLaTeX (i.e. latexmk -xelatex mwe.tex), I get the following warning:

Missing character: There is no   (U+0020) in font [academicons.ttf]:!

What does it mean, can we fix or surpress it?

Full log:

Latexmk: This is Latexmk, John Collins, 6 Nov. 2023. Version 4.81.
No existing .aux file, so I'll make a simple one, and require run of *latex.
Latexmk: applying rule 'xelatex'...
Rule 'xelatex':  Reasons for rerun
Category 'other':
  Rerun of 'xelatex' forced or previously required

------------
Run number 1 of rule 'xelatex'
------------
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Running 'xelatex -no-pdf -recorder  "test.tex"'
------------
This is XeTeX, Version 3.141592653-2.6-0.999995 (TeX Live 2023) (preloaded format=xelatex)
 restricted \write18 enabled.
entering extended mode
(./test.tex
LaTeX2e <2022-11-01> patch level 1
L3 programming layer <2023-03-30>
(/usr/local/texlive/2023/texmf-dist/tex/latex/base/article.cls
Document Class: article 2022/07/02 v1.4n Standard LaTeX document class
(/usr/local/texlive/2023/texmf-dist/tex/latex/base/size10.clo))
(/usr/local/texlive/2023/texmf-dist/tex/latex/academicons/academicons.sty)
(/usr/local/texlive/2023/texmf-dist/tex/latex/l3backend/l3backend-xetex.def)
(./test.aux) (/usr/local/texlive/2023/texmf-dist/tex/latex/base/ts1cmr.fd)
(/usr/local/texlive/2023/texmf-dist/tex/latex/academicons/tuacademicons.fd)
Missing character: There is no   (U+0020) in font [academicons.ttf]:!
[1] (./test.aux) )
Output written on test.xdv (1 page, 656 bytes).
Transcript written on test.log.
Latexmk: Getting log file 'test.log'
Latexmk: Examining 'test.fls'
Latexmk: Examining 'test.log'
Latexmk: Log file says output to 'test.xdv'
Latexmk: applying rule 'xdvipdfmx'...
Rule 'xdvipdfmx':  Reasons for rerun
Changed files or newly in use/created:
  test.xdv
Category 'changed_source_rules':
  xelatex

------------
Run number 1 of rule 'xdvipdfmx'
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Running 'xdvipdfmx -E -o "test.pdf"  "test.xdv"'
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test.xdv -> test.pdf
[1]
8307 bytes written
Latexmk: Summary of warnings from last run of *latex:
  =====Latex reported missing or unavailable character(s).
=====See log file for details.
Latexmk: ====List of undefined refs and citations:
  Missing character: There is no   (U+0020) in font [academicons.ttf]:!
Latexmk: All targets (test.pdf) are up-to-date

mwe.tex:

\documentclass{article}
\usepackage{academicons}
\begin{document}
  Test {\aiGoogleScholar}!
\end{document}