Cannot boot into Recovery What I've done


Disable T2 Security Boot
In Catalina
Add a APFS Volume mac2
Install Mojave on Volume mac2 from an external drive
(Install security update, copy files and etc.)
Remove Macintosh HD and its Data volume in Mojave


Then when I tried to boot into Recovery, it turns into Internet Recovery (and failed with code -1008F).

Is there a known way to make Recovery work (or reinstall only Recovery), before I try to install Mojave again in-place?

Some info:

~ $ diskutil mount Recovery
Volume Recovery on Recovery mounted

~ $ ls /Volumes/Recovery/
C755CEE7-&lt;rest of the UUID&gt;


where C755CEE7... is the volume UUID of Volume mac2.
Ran into the same issue, but when I bought the mac at the apple seems it was hardcoded to stay with Catalina and not downgrade to Mojave.