I found some constellations that will not work correctly when you have 1 channel name several times with different links (of which some are bad links) merged.

Example that is ok (the good link is played automatically):
Channel #1 BAD Link
Channel #2 BAD Link
Channel #3 Link OK
Channel #4 BAD Link

Example that is NOT ok:
Channel #1 BAD Link
Channel #2 Link OK
Channel #3 BAD Link
Channel #4 BAD Link

Another example that is NOT ok:
Channel #1 BAD Link
Channel #2 Link OK

Can you please test this?
Thank you!

Do you use ProgDVB Engine? Must working...

Yes, ProgDVB Engine is turned on. It works fine e.g. in that constellation:

Channel #1 BAD Link
Channel #2 BAD Link
Channel #3 Link OK
Channel #4 BAD Link

but not in the other constellations mentioned below.
Should be easy to reproduce with any channel.

Thank you!

Can you prepare test m3u?

Please test this m3u. Does it work merging the channels?
The index2500.m3u8 link is the good one.
Thank you!

#EXTM3U

#EXTINF:-1,RT_Not_OK1
https://secure-streams.akamaized.net/rt/BAD1.m3u8

#EXTINF:-1,RT_Not_OK1
https://secure-streams.akamaized.net/rt/index2500.m3u8

#EXTINF:-1,RT_Not_OK2
https://secure-streams.akamaized.net/rt/BAD1.m3u8

#EXTINF:-1,RT_Not_OK2
https://secure-streams.akamaized.net/rt/index2500.m3u8

#EXTINF:-1,RT_Not_OK2
https://secure-streams.akamaized.net/rt/BAD2.m3u8

#EXTINF:-1,RT_Not_OK2
https://secure-streams.akamaized.net/rt/BAD3.m3u8