Issue located
I make it work with SCOM 2019 console on SCOM 2022 & SSRS 2019 environment
On separate server been installed SQL CLR Types 2014, Report Viewer 2015 and SCOM 2019 Console (directly with msi file) without any UR for it
All custom reports now working
Removed SCOM 2022 console from Management Server, installed SCOM 2019 one - and it works
Yes, its dirty workaround, but we have about 20 critical custom SCOM related reports, and work this them on browser not really convenient
Now, next challenge (if only Microsoft wont fix this) is to make it work with SCOM 2022 console
First obsticle is that there is no newer version ReportViewer runtime available, now its inside Microsoft Report RDLC Designer for Visual Studio...
@DG Malcolm , did you install any SCOM 2019 UR4 just before that happen? Try clean console installation on separate server