I could not find any blue posts, hotfixes or patch notes about this therefor could not back that up.
If what you are saying is true then I believe there is a problem with this
"if a proc has an average proc interval of 45 sec, and it’s been 72 sec since your last successful proc, you’ll get a 1.3x multiplier to your proc chance."
The proc multiplier could may well not be working for all trinkets if not most of them. Feel free to read about it here ( theorycrafting tab )
https://eu.battle.net/forums/en/wow/topic/6892090046#1
No I did not, sorry.