Another positive data point. I got two separate tickets for LCA-DOH and DOH-SIN. Managed to get the e-boarding pass for DOH-SIN 48 hours prior to flight time but not for LCA-DOH. I therefore prepared the entry docs for Qatar, thinking that I only needed to get the boarding pass for the first leg. The plan was to proceed with the second leg with my e-pass once I arrived in Doha (no check-in luggage). It turned out that the staff at check-in was curious that I flew to Doha only. I then told her about the subsequent flight to SIN. She ended up linking my both flights and checked my docs for SIN instead. There was some brief conversation with her colleagues but the whole thing was smooth.