Okay, i'll do my best :
1/ I made 2 tactics : 1st with swap effective // 2nd with swap non effective
2/ I made 2 saves : 1st "Bug swap role 2 tactics before match" // 2nd "Bug swap role 2 tactics after match"
3/ I join a .pkm of the match (Bournemouth - Man City) - "1st Half no Swap - 2nd Half with Swap"
> 1st Half with the 2nd tct (swap non effective)
> 2nd Half with the 1st tct (swap effective) - you can see the swap at min : 47' - 58' - 72' - 78' - 84' (Swap Grealish - Mahrez // Swap Bellingham - De Bruyne)
Hope that all these help and you can fix these =)
Feel free to contact me if it's not enough clear =)
Regards