Hello, the following MWE produces an error, which looks like it might be a bug:
```
\localrightbox{xyz}%
\hfill\break
\localleftbox{abc}%
\bye
```
Output:
```
This is LuaTeX, Version 1.21.0 (TeX Live 2025/Homebrew)
restricted system commands enabled.
(./free.tex
warning (nodes): attempt to copy free hlist node 399, ignored
warning (nodes): attempt to copy free hlist node 369, ignored
Underfull \hbox (badness 10000) in paragraph at lines 2--4
[1{/opt/homebrew/Cellar/texlive/20250308_1/share/texmf-dist/fonts/map/pdftex/up
dmap/pdftex.map}])
(see the transcript file for additional information)</opt/homebrew/Cellar/texli
ve/20250308_1/share/texmf-dist/fonts/type1/public/amsfonts/cm/cmr10.pfb>
Output written on free.pdf (1 page, 8930 bytes).
Transcript written on free.log.
```
Additionally, the \localleftbox contents do not appear.
Additional information from luatex --credits:
```
Compiled with libpng 1.6.47; using 1.6.47
Compiled with lua version 5.3.6
Compiled with mplib version 2.11
Compiled with zlib 1.2.12; using 1.2.12
Development id: 7667
```
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