Strange rotation of listener.log

Hi,

we have a RAC 19 where rotation of listener.log is happening in a way we cannot understand.

There are not any parameter in listener.ora related with rotation, not LOG_FILE_NUM_ nor LOG_FILE_SIZE_ so we assume the default should be in place, which means LOG_FILE_NUM_ with no values (we cannot find any documented default for this parameter) and LOG_FILE_SIZE_ with default 300MB.

As for our understanding we should have a single listener.log rotating to listener_1.log then listener_2.log and so on, when file size reaches 300MB.

Identical steps for scan listener.