I am using Leap 15.5 on an old ASUS laptop, model R541U.  The wifi was working
fine when I initially installed Leap 15.4 as the sole OS around April 2023. 
The wifi started acting flaky in September 2023, but I didn't pay much
attention because it has been working.  
I finally took the time to try to get it working again.  I set the power save
parameters off, the debug_mask to 0xFFFFFFFFFFFFFFFF, and the debug_level to 5.
 I also set NetworkManager to use a permanent MAC address for wlan0 because
there the error seemed to be associated with a message "Init MAC" failed.  
The device still fails in 2 situations, and reports the "Init MAC" error.  The
first is after suspending the laptop.  Presumably the power save from the
suspend is not dependent on the driver power save parameters, so it attempts
and fails to reinitialize the wlan0 device.  With debug level at 5, I see
rtlwifi report "init MAC Fail as power on failure", the the "Init MAC failed"
message from rtl8723be, then the message "Failed to config hardware!" from
rtlwifi.   The other failure arises when the connection to the AP is lost for
10s (at least that's what it reports) after rebooting with no intervening
suspend.  In the latter case, there are a lot of messages "Waiting for FW read
clear HMEBox(0)!!! 0x130 = ff".

The "Init MAC failed" message first appears in my messages file dated
2023-09-11.  The previous rolled messages file is dated 2023-09-08.  Looking at
the zypp/history log, I evidently updated the kernel from 5.14.21-150400.24.74
to 5.14.21-150400.24.81, somewhere around August 31 or September 6 of 2023.  I
only updated the distribution on the laptop to 15.5 recently.