At least after #737 we are sending the queries at the same time so there is a greater chance of Duplicate Question Suppression https://datatracker.ietf.org/doc/html/rfc6762#section-7.3

grep _googlecast._tcp.local home-assistant.log

2021-06-19 08:49:24 DEBUG (MainThread) [zeroconf] Sending to (None, 5353) (40 bytes #1) <DNSOutgoing:{multicast=True, flags=0, questions=[ptr[question,QM,in,_googlecast._tcp.local.]], answers=[], authorities=[], additionals=[]}> as b'\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x0b_googlecast\x04_tcp\x05local\x00\x00\x0c\x00\x01'...
2021-06-19 08:49:24 DEBUG (MainThread) [zeroconf] Received from '192.168.107.5':5353 (socket 25): <DNSIncoming:{id=0, flags=0, truncated=False, n_q=1, n_ans=0, n_auth=0, n_add=0, questions=[ptr[question,QM,in,_googlecast._tcp.local.]], answers=[]}> (40 bytes) as [b'\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x0b_googlecast\x04_tcp\x05local\x00\x00\x0c\x00\x01']
2021-06-19 08:49:24 DEBUG (MainThread) [zeroconf] Sending to (None, 5353) (40 bytes #1) <DNSOutgoing:{multicast=True, flags=0, questions=[ptr[question,QM,in,_googlecast._tcp.local.]], answers=[], authorities=[], additionals=[]}> as b'\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x0b_googlecast\x04_tcp\x05local\x00\x00\x0c\x00\x01'...
2021-06-19 08:49:24 DEBUG (MainThread) [zeroconf] Received from '192.168.107.3':5353 (socket 25): <DNSIncoming:{id=0, flags=33792, truncated=False, n_q=0, n_ans=1, n_auth=0, n_add=3, questions=[], answers=[record[ptr,in,_googlecast._tcp.local.]=120/119,Zolo-Mojo-8f3ff1fca49f3b5932a9ddf0a552c4e4._googlecast._tcp.local., record[txt,in-unique,Zolo-Mojo-8f3ff1fca49f3b5932a9ddf0a552c4e4._googlecast._tcp.local.]=4500/4499,b'#id=8f3'..., record[srv,in-unique,Zolo-Mojo-8f3ff1fca49f3b5932a9ddf0a552c4e4._googlecast._tcp.local.]=120/119,8f3ff1fc-a49f-3b59-32a9-ddf0a552c4e4.local.:8009, record[a,in-unique,8f3ff1fc-a49f-3b59-32a9-ddf0a552c4e4.local.]=120/119,192.168.107.3]}> (364 bytes) as [b'\x00\x00\x84\x00\x00\x00\x00\x01\x00\x00\x00\x03\x0b_googlecast\x04_tcp\x05local\x00\x00\x0c\x00\x01\x00\x00\x00x\x00-*Zolo-Mojo-8f3ff1fca49f3b5932a9ddf0a552c4e4\xc0\x0c\xc0.\x00\x10\x80\x01\x00\x00\x11\x94\x00\xbc#id=8f3ff1fca49f3b5932a9ddf0a552c4e4#cd=0CC3AD1C84EA89BBDC61582A2B5D3387\x13rm=B63D199BF3B3D7A5\x05ve=05\x0cmd=Zolo Mojo\x12ic=/setup/icon.png\x13fn=Backyard Speaker\x07ca=2052\x04st=0\x0fbs=FA8FCA6CEA94\x04nf=1\x03rs=\xc0.\x00!\x80\x01\x00\x00\x00x\x00-\x00\x00\x00\x00\x1fI$8f3ff1fc-a49f-3b59-32a9-ddf0a552c4e4\xc0\x1d\xc15\x00\x01\x80\x01\x00\x00\x00x\x00\x04\xc0\xa8k\x03']
2021-06-19 08:50:54 DEBUG (MainThread) [zeroconf] Sending to (None, 5353) (40 bytes #1) <DNSOutgoing:{multicast=True, flags=0, questions=[ptr[question,QM,in,_googlecast._tcp.local.]], answers=[], authorities=[], additionals=[]}> as b'\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x0b_googlecast\x04_tcp\x05local\x00\x00\x0c\x00\x01'...
2021-06-19 08:50:54 DEBUG (MainThread) [zeroconf] Received from '192.168.107.5':5353 (socket 25): <DNSIncoming:{id=0, flags=0, truncated=False, n_q=1, n_ans=0, n_auth=0, n_add=0, questions=[ptr[question,QM,in,_googlecast._tcp.local.]], answers=[]}> (40 bytes) as [b'\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x0b_googlecast\x04_tcp\x05local\x00\x00\x0c\x00\x01']
2021-06-19 08:50:54 DEBUG (MainThread) [zeroconf] Sending to (None, 5353) (40 bytes #1) <DNSOutgoing:{multicast=True, flags=0, questions=[ptr[question,QM,in,_googlecast._tcp.local.]], answers=[], authorities=[], additionals=[]}> as b'\x00\x00\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x0b_googlecast\x04_tcp\x05local\x00\x00\x0c\x00\x01'...
2021-06-19 08:50:54 DEBUG (MainThread) [zeroconf] Received from '192.168.107.3':5353 (socket 25): <DNSIncoming:{id=0, flags=33792, truncated=False, n_q=0, n_ans=1, n_auth=0, n_add=3, questions=[], answers=[record[ptr,in,_googlecast._tcp.local.]=120/119,Zolo-Mojo-8f3ff1fca49f3b5932a9ddf0a552c4e4._googlecast._tcp.local., record[txt,in-unique,Zolo-Mojo-8f3ff1fca49f3b5932a9ddf0a552c4e4._googlecast._tcp.local.]=4500/4499,b'#id=8f3'..., record[srv,in-unique,Zolo-Mojo-8f3ff1fca49f3b5932a9ddf0a552c4e4._googlecast._tcp.local.]=120/119,8f3ff1fc-a49f-3b59-32a9-ddf0a552c4e4.local.:8009, record[a,in-unique,8f3ff1fc-a49f-3b59-32a9-ddf0a552c4e4.local.]=120/119,192.168.107.3]}> (364 bytes) as [b'\x00\x00\x84\x00\x00\x00\x00\x01\x00\x00\x00\x03\x0b_googlecast\x04_tcp\x05local\x00\x00\x0c\x00\x01\x00\x00\x00x\x00-*Zolo-Mojo-8f3ff1fca49f3b5932a9ddf0a552c4e4\xc0\x0c\xc0.\x00\x10\x80\x01\x00\x00\x11\x94\x00\xbc#id=8f3ff1fca49f3b5932a9ddf0a552c4e4#cd=0CC3AD1C84EA89BBDC61582A2B5D3387\x13rm=B63D199BF3B3D7A5\x05ve=05\x0cmd=Zolo Mojo\x12ic=/setup/icon.png\x13fn=Backyard Speaker\x07ca=2052\x04st=0\x0fbs=FA8FCA6CEA94\x04nf=1\x03rs=\xc0.\x00!\x80\x01\x00\x00\x00x\x00-\x00\x00\x00\x00\x1fI$8f3ff1fc-a49f-3b59-32a9-ddf0a552c4e4\xc0\x1d\xc15\x00\x01\x80\x01\x00\x00\x00x\x00\x04\xc0\xa8k\x03']

Multi service browsers of the same type create excessive queries #721

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