I still have these assets above showed up as "unknown."
All the assets in your list are "Packaged" in TRS22 SP1. Below the list of DLCs they belong to (maybe some come from "Additional TANE Assets for TRS19" package which is available in the built-in Content Store):
Andrushivka - Vinnitsa UZ
Bairnsdale to Orbost Line C1970-80s
Balezino - Mosti, Russia
Belarusian woodland
Brazemore Yard
British Model Railway
C&O Hinton Division
Canadian Rocky Mountains - Columbia River Basin
Canadian Rocky Mountains - Golden, BC
Canadian Rocky Mountains - Rogers Pass
Centrella Sub Division - TRS19
Chiyoda Branch Line
Coal Country
Coalmint Mountains Railroad
Cornish Mainline and Branches - TRS19
Datsun Junction MRR
ECML EDINBURGH - DUNDEE
ECML Kings Cross - Edinburgh
Fall Harvest Nebraska - Redux
Fall Harvest - Nebraska
Franklin Avenue Industrial
Healesville - 1913-1920
Japan - Model Trainz
Kickstarter County
Kickstarter County
Lafond Regional Railway
Leadville Sub Division - TRS19
Legacy of the Burlington Northern v2
Lone Pine Branch
Loop Line
Midwestern Rails
Milwaukee Road Avery-Drexel
Mojave Sub Division
Mojave Sub Division
Niddertalbahn
Niddertalbahn - TRS19
Port Zyd & Fulazturn Railroad - Model Trainz
Rodnye Prostory - SND
Rostov uzel 2018
Schwaninger Land
Season Town Northern RR
Sebino Lake, Italy (1980s)
Shortline Railroad - TRS19
The Bidye Traction Railroad - Model Trainz
The Shortz & Kerl Traction Railroad - Model Trainz
Tidewater Point Rail v3
TRS19 - The Cilie Oldphartz NG Logging Railroad - Model Trainz Layout
TRS19 - The Cilie Oldphartz NG Mining Railroad - Model Trainz Layout
TRS19 - The Cilie Oldphartz SG Logging Railroad - Model Trainz Layout
TRS19 - The Innter Kohn Necktion NG Railroad - Model Trainz Layout
TRS19 - The Innter Kohn Necktion Railroad - Model Trainz Layout
TRS19 Canadian Rocky Mountains - Viktor Lake to Ross Peak & Glacier
TRS19 Canadian Rocky Mountains Baker Crk to West of Calgary
TRS19 Canadian Rocky Mountains Beavermouth to Ottertail
TRS19 Canadian Rocky Mountains Ottertail to Castle Jct.
VR Healesville - 1913-1920 TRS19
Warwick - Wallangarra
West from Denver - Moffat Route
Znamensk-Svir