Module debugging

[MichaelZhuravsky]

Hello!
I have a rare question )

How to debug an xposed module?

I'm on A12, but as I remembered there was a problem since A10.

On A9- I should use
adb shell am set-debug-app -w --persistent packageName
and(!) use xdebuggable as well (without this the debugger won't to stop at breakpoints)

But on A12 the variant above is not suitable: no breakpoints and even the module itself (debug version) don't work.
Replacing xdebuggable with xappdebug leads nothing.

So what should I do to catch workable breakpoints inside my module that hooked a target app?