Seeing lots of multicast listener reports after upgrade to 4.19.112

We have recently updated our switching product to kernel version 4.19.112 from version 4.1.49. When multiple devices are connected to each other in a stack they send Router Advertisements periodically. After updating to 4.19.112 we are observing that whenever a device sends Router Advertisement all the connected devices start to respond with Multicast Listener Report Message v2. Is there a way I can stop these packets from being sent out? We do not use IGMP in our product.

I tried to play around with parameters like net.ipv6.conf.all.mldv2_unsolicited_report_interval but that did not help. At best I was able to switch between v1 and v2 by setting this:
net.ipv6.conf.all.force_mld_version

Thanks
Dipinder