Can't export to pdf when a language is explicitly defined

Reproduction steps:

• Visit http://localhost:8080/xwiki/bin/view/Sandbox/?language=en (or http://localhost:8080/xwiki/bin/view/Sandbox/?language=fr)
• Export using Export as PDF (LaTeX)
• No need to change the default configuration at the configuration step
• Wait for "You can now download your export." to be displayed in the success box

Expected:

• Clicking on "download" downloads a pdf

Actual:

• Clicking on "download" download a zip with the latex sources

Note: No error in the job log, for instance,

Starting job of type [LaTeXExportJob] with identifier [export/latex/1684231080045-140]
Finished job of type [LaTeXExportJob] with identifier [export/latex/1684231080045-140]

Note: tested on 15.4-SNAPSHOT