It's usually due to bugs in the Wi-Fi home gateway routers (APs), or sometimes in the wireless client chipsets/drivers/software.
On Wi-Fi, sending multicasts from the AP to the wireless clients (this is known in the standard as "From the Distribution System" or "FromDS") is tricky, so there are lots of ways it can fail, and it's easy to introduce bugs.
A couple other things to note, regarding wired to wireless multicast transmissions:
August 31, 2015
Why do some WiFi routers block multicast packets going from wired to wireless
Posted by Tiebing at 8/31/2015