v$sessionlongops doesn't show progress RMAN

[Yuri]

I should check the progress of the full rman backup.
The following query does not extract any records.

Percentage rman backup
select
sid
,start_time
,totalwork
,sofar
,case totalwork when 0 then round((sofar/1) * 100,2) else round((sofar/totalwork) * 100,2) end pct_done
from
v$session_longops
where
totalwork > sofar
order by start_time desc;

The last extracted records are from 6 days ago and opname='Gather Table's Index Statistics'.
select * from v$session_longops order by start_time desc;

The full rman backup is running: is there a reason why no records are being extracted?
Until last week I was extracting correctly.

Thanks

[Yuri]

after restarting oracle 19 instance, the v$session_longops table resumed correctly extracting records: could this be a bug?