Iœôòùd like to ask if there is any update on this:

The same issue has now arisen with context-simpleslides (hi Aditya and
Thomas), which now has:
scripts/context/lua/third/simpleslides/mtx-simpleslides.lua

The t- prefix doesn't make a difference to TL, so I went ahead and added
scripts/context/lua/third/PKGNAME to our patterns and updated
simpleslides.

Philipp, if you move mtx-rst.lua to scripts/context/lua/third/rst,
(instead of directly under lua/), I'll update rst too.

Thanks,
Karl