Here some debug statements from the LMiC, setting debug level to 2.
9329234: engineUpdate, opmode=0x908
9329311: Uplink data pending
9329373: Considering band 0, which is available at 10930440
9329610: Considering band 1, which is available at 9482879
9329941: Considering band 2, which is available at 4950416
9330273: Considering band 3, which is available at 0
9330584: No channel found in band 3
9330774: Considering band 0, which is available at 10930440
9331111: Considering band 1, which is available at 9482879
9331443: Considering band 2, which is available at 4950416
9331788: No channel found in band 2
9331978: Considering band 0, which is available at 10930440
9332315: Considering band 1, which is available at 9482879
9332648: Airtime available at 9482879 (channel duty limit)
9332979: Airtime available at 9576587 (global duty limit)
9333305: Uplink delayed until 9576587
9333524: Scheduled job 0x449, cb 0x2007 at 95764629576572: Running job 0x449, cb 0x2007, deadline 9576462
9576691: engineUpdate, opmode=0x108
9576768: Uplink data pending
9576903: Airtime available at 9482879 (previously determined)
9577252: Airtime available at 9576587 (global duty limit)
9577578: Ready for uplink
9578410: Updating info for TX at 9576767, airtime will be 2896. Setting available time for band 1 to 2357133312
9578769: TXMODE, freq=868300000, len=14, SF=7, BW=125, CR=4/5, IH=0
9581294: irq: dio: 0x0 flags: 0x8
9581386: Scheduled job 0x449, cb 0xef3 ASAP
9582107: Running job 0x449, cb 0xef3, deadline 0
9582223: Scheduled job 0x449, cb 0xc45 at 9643155
9643485: Running job 0x449, cb 0xc45, deadline 9643155
9643669: RXMODE_SINGLE, freq=868300000, SF=7, BW=125, CR=4/5, IH=0
9646830: irq: dio: 0x0 flags: 0x40
9646951: Scheduled job 0x449, cb 0x20cd ASAP
9647675: Running job 0x449, cb 0x20cd, deadline 0
9648280: Received downlink, window=RX1, port=-1, ack=1
9648387: 109648469: engineUpdate, opmode=0x800
9650217: engineUpdate, opmode=0x808
9650293: Uplink data pending
9650356: Considering band 0, which is available at 10930440
9650593: Considering band 1, which is available at 9866367
9650925: Considering band 2, which is available at 4950416
9651257: Considering band 3, which is available at 0
9651567: No channel found in band 3
9651757: Considering band 0, which is available at 10930440
9652095: Considering band 1, which is available at 9866367
9652427: Considering band 2, which is available at 4950416
9652771: No channel found in band 2
9652961: Considering band 0, which is available at 10930440
9653298: Considering band 1, which is available at 9866367
9653632: Airtime available at 9866367 (channel duty limit)
9653962: Uplink delayed until 9866367
9654180: Scheduled job 0x449, cb 0x2007 at 98662429866336: Running job 0x449, cb 0x2007, deadline 9866242
9866454: engineUpdate, opmode=0x8
9866527: Uplink data pending
9866655: Airtime available at 9866367 (previously determined)
9867003: Ready for uplink
9867835: Updating info for TX at 9866526, airtime will be 3216. Setting available time for band 1 to 1969094656
9868194: TXMODE, freq=868500000, len=16, SF=7, BW=125, CR=4/5, IH=0
9871348: irq: dio: 0x0 flags: 0x8
9871440: Scheduled job 0x449, cb 0xef3 ASAP
9872161: Running job 0x449, cb 0xef3, deadline 0
9872277: Scheduled job 0x449, cb 0xc45 at 9933209
9933544: Running job 0x449, cb 0xc45, deadline 9933209
9933727: RXMODE_SINGLE, freq=868500000, SF=7, BW=125, CR=4/5, IH=0
9935632: irq: dio: 0x1 flags: 0x80
9935725: Scheduled job 0x449, cb 0x20cd ASAP
9936448: Running job 0x449, cb 0x20cd, deadline 0
9936565: Scheduled job 0x449, cb 0xc71 at 9995453
9995936: Running job 0x449, cb 0xc71, deadline 9995453
9996120: RXMODE_SINGLE, freq=869525000, SF=9, BW=125, CR=4/5, IH=0
10000040: irq: dio: 0x1 flags: 0x80
10000136: Scheduled job 0x449, cb 0x20e4 ASAP
10000861: Running job 0x449, cb 0x20e4, deadline 0
10000969: 1010001058: engineUpdate, opmode=0x900
10002793: engineUpdate, opmode=0x908
10002873: Uplink data pending
10002938: Considering band 0, which is available at 10930440
10003186: Considering band 1, which is available at 10188126
10003529: Considering band 2, which is available at 4950416
10003867: Considering band 3, which is available at 0
10004182: No channel found in band 3
10004379: Considering band 0, which is available at 10930440
10004722: Considering band 1, which is available at 10188126
10005065: Considering band 2, which is available at 4950416
10005415: No channel found in band 2
10005610: Considering band 0, which is available at 10930440
10005953: Considering band 1, which is available at 10188126
10006308: Airtime available at 10188126 (channel duty limit)
10006639: Airtime available at 10264935 (global duty limit)
10006977: Uplink delayed until 10264935
10007207: Scheduled job 0x449, cb 0x2007 at 1026481010265398: Running job 0x449, cb 0x2007, deadline 10264810
10265523: engineUpdate, opmode=0x108
10265602: Uplink data pending
10265752: Airtime available at 10188126 (previously determined)
10266113: Airtime available at 10264935 (global duty limit)
10266450: Ready for uplink
10267288: Updating info for TX at 10265601, airtime will be 2896. Setting available time for band 1 to 255918080
10267653: TXMODE, freq=868100000, len=14, SF=7, BW=125, CR=4/5, IH=0
10270184: irq: dio: 0x0 flags: 0x8
10270278: Scheduled job 0x449, cb 0xef3 ASAP
10271003: Running job 0x449, cb 0xef3, deadline 0
10271121: Scheduled job 0x449, cb 0xc45 at 10332045
10332390: Running job 0x449, cb 0xc45, deadline 10332045
10332579: RXMODE_SINGLE, freq=868100000, SF=7, BW=125, CR=4/5, IH=0
10335118: irq: dio: 0x0 flags: 0x40
10335239: Scheduled job 0x449, cb 0x20cd ASAP
10335965: Running job 0x449, cb 0x20cd, deadline 0
10336562: Received downlink, window=RX1, port=-1, ack=1
10336673: 1010336761: engineUpdate, opmode=0x800
It seems that the message is received in RX1 window but not interpreted or used.