hey i was as usual checking little wigs / big wigs for the mechanics on the new bosses because i edit them to my needs. i usually compare these to the warrior google doc thats a staple for ages.
https://docs.google.com/spreadsheets/d/e/2PACX-1vQQCkBEkOadsvO4sTphB1RwzC6Z_3kq00IFaBrCk5Eagz2Jeoox7D7Rk3XwXMINbh4lUg9Vr-3RgoB2/pubhtml#
surely also wowhead dungeon guides also work to check for missing abilities.

checking ol'waxbeared for example in darkflame cleft already missing 3 abilities:
cave-in ; crude weapons; high speed collision;

might be more to come. would be awesome to add/check everything until new season starts !
even if they seem to be a minor thing / not importent, at least add them as default unchecked.
(esp as warrior that can reflect the abilities, this is very important tool to use)

LittleWigs is fully up to date for Season 2. The abilities you cited are not going to be added.

cave-in

This is part of Reckless Charge which already alerts. It's completely avoidable (ground swirlies) and just because it's blockable physical damage if you stand in it does not mean that it needs a separate alert.

crude weapons

This stacks dozens of times at a rate of more than once per second. It stacks on whoever is fixated by the adds on every melee hit. There is already an alert for the fixate. We're not going to alert you every time you get meleed when you are fixated by 15 adds.

high speed collision

The mine cart is constantly moving across the arena. You obviously shouldn't be standing in it. Just because some spreadsheet lists the damage from standing in it as not blockable and not reflectable doesn't mean LittleWigs needs an alert for it.

Feel free to actually run the dungeons and suggest things that you think are missing based on your experience. But quoting a couple abilities from a spreadsheet without understanding the context around them is not productive.