Problems after setting up wi-fi

Hello all,
SNAPSHOT r13338-d6f66dd88e / LuCI Master git-20.140.43567-aac1a8d
Kernel Version 4.19.123
driver name: mwlwifi
chip type: 88W8864
hw version: 7
driver version:
firmware version: 0x0702091a

I own the following routers: wrt1900acs v2 and wdr3600
In the last two OpenWrt/SuperWrt compilations I noticed a problem on the wi-fi side after configuration.
More precisely after setting up a wi-fi network, the second one becomes unusable after I save the changes.
Have you noticed this problem?