Filtering of logs to different backends

[rgundi]

This is with Zephyr 3.2. I see some weird behavior while trying to selectively enable logging for 2 different backends (see below). The module used is a custom module called "logs_module" in my project. I am using Log shell for the below experiments.

log backend shell_uart_backend disable logs_module
log backend shell_uart_backend enable dbg logs_module
The above shell commands are for enabling and disabling logs_module print only for uart_shell. After executing the disable command, I don't see any messages from logs_module in the shell_uart (which is what is expected). However, I don't see any messages even in the fs backend too (which is not expected). When enabled it is being seen in both the backends

log backend log_backend_fs disable logs_module
log backend log_backend_fs enable dbg logs_module
This is the same command for fs backend. This doesn't seem to have any effect. The messages are seen in both the backends, even after executing the "disable" command.

I can confirm similar behavior while using log_filter_set in the code.