Note:
The issue looks like it's from tty directly but I don't see who is the maintainer, so I email the closest I can get

Description:
In command line, sticky keys reset only when typing ASCII and ISO-8859-1 characters.
Tested with the QWERTY Lafayette layout: https://codeberg.org/Alerymin/kbd-qwerty-lafayette

Observed Behaviour:
When the layout is loaded in ISO-8859-15, most characters typed don't reset the sticky key, unless it's basic ASCII characters or Unicode
When the layout is loaded in ISO-8859-1, the sticky key works fine.

Expected behaviour:
Sticky key working in ISO-8859-1 and ISO-8859-15

System used:
Arch Linux, kernel 6.16.3-arch1-1