I can't be this lucky. Trial Master ninja patched?

I'm pretty sure the spawnrate has been the same the whole league.
When I decided to start going to complete all challenges (prior I had about 8-10 trialmasters, so I wasnt to worried about getting him again for the tether challenge) it tooked me well over 400+ maps / about 4 weeks untill I finally got him again to finished that last challenge (didnt skiped or failed any ultimatum in that timespan).
Felt really bad to have no way to counter bad rng to complete a challenge, in the past you could at least buy more tries in some way. Sure I could have spam non alc'd maps and speedrun them to get it in shorter amount of time but thats not really enjoyable to me.
Anyway, the day I found him again to get last challenge done I found him 2 more times in the next 20-30 maps.
Also earlier in the league, after a patch, I found him 4 times in 2 days - at first I thought the spawnrate received a buff but it was just luck.

I hope we dont see such rng heavy encounter for challenges ever again.