Hi could I ask advice I need to complete my tdac tomorrow I’m flying from Manchester and have a layover in Dubai I assume I put my departing flight as Manchester but then add my flight number from Dubai to Bangkok ? Everyone telling me something different

Hello all, had a quick question about COE and flight numbers. I am flying from Denver to Chicago then Chicago to Doha and then to BKK. I noticed my first flight number on my COE is wrong, the flight number was changed but the date and time is exactly the same. I am currently in Chicago. The other two flight numbers are correct. I was able to check in for my next flight with no problem and was told I should be able to check in bkk as well. I was just worried that immigration may have a problem with it once I’m in Bangkok. I guess I’m asking should I consider trying to change the COE before I get there? (If possible) Will immigration check my boarding passes? Will they care about just a number change? Anyone with any experience or info about this?