T9405 fails on Windows

The T9405 testcase currently fails on Windows,

=====> T9405(normal) 8 of 14 [0, 1, 0]
cd "./rts/T9405.run" && $MAKE -s --no-print-directory T9405  
Wrong exit code (expected 0 , actual 2 )
Stdout:
[1 of 1] Compiling Main             ( T9405.hs, T9405.o )
Linking T9405.exe ...

Stderr:
make[1]: *** [Makefile:50: T9405] Error 1

Contrary to what was suggested in ticket:12004#comment:120267 it looks like the problem is that an empty .ticky file is produced. Even increasing the sleep time to 10 seconds (after bumping the sleep in T9405.hs accordingly) doesn't change this, so I suspect there is a runtime system bug here.