Lighting Issues in a World

Device: Sony Xperia XA (F3116)

Hello and good day.
I'm creating this thread to report a bug regarding about the lighting issues that affected on 1.9.0.3 beta version on my phone.
Situation: I played on my world as usual. However, when I entered to a railway tunnel that I made in my world, I discovered that the tunnel was dark, even though that I have already placed torches and ses lanterns there. Once I placed a lighting source, the tunnel in my world became normal (illuminated).

Thank you for taking your time by checking this bug report.
Hopefully to hear from you soon.

NOTE: The attachment below shows the situation that I was talking about.