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I was asked to provide proof of onward travel on my flight from Singapore to Kochi.
Upvote:2
You seem to have missed a critical piece - the visa states (third line from the bottom in your photo):
Continuous stay during each visit not to exceed 90 days - you need to leave before the 90 days are full. You can come back multiple times during the year, but you cannot stay the whole year.
With that, having a return trip booked makes a lot more sense. However, as others said, typically they don't ask for proof of the booking.