When using beamer to write slides, \footfullcite
the commands and related settings used are as follows:
%----------- 脚标参考文献 ----------------%
\usepackage[backend=bibtex,sorting=none]{biblatex}
\addbibresource{./content/the_ref.bib} %BibTeX数据文件及位置
\setbeamerfont{footnote}{size=\tiny}
%--- 参考例子
\footfullcite{bib_item} %文献item
In Overleaf's settings: Compiler is pdfLatex.
Tex Live version 2022 can display the normal size=\tiny
set font size.
But for Tex Live version 2023 , size=\tiny
the setting does not work.
Finally, the font was manually adjusted to 2022 to reach \tiny
the size. Record this bug.