I can’t replicate this issue, so the software updates themselves may not be the (whole) cause of this issue.
Verify that your router is set to combine the wired and wireless as one logical network. It would probably also require that the wireless network isn’t split up using several SSID network names, as that conflicts with combining.
Recommended settings for Wi-Fi routers and access points - Apple Support
Unless someone else chimes in with a new idea, I would suggest to contact an expert from the Apple Support staff for further assistance. Contact Apple for support and service (phone numbers) or start your support request online (chat/email/callback).