1.1.1.2 and 1.1.1.3 both return the SVCB records for 1.1.1.1. (I don't know if clients would ignore them, or actually switch to 1.1.1.1.)
Non-SVCB-type queries for _dns.resolver.arpa return NXDOMAIN instead of NOERROR. (This probably doesn't have significant impact, but might break it for some clients, e.g. if they can be tricked into making queries for _dns.resolver.arpa, or if a downstream resolver makes DS queries.)
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[ 2.1 ms ] story [ 12.3 ms ] thread1.1.1.2 and 1.1.1.3 both return the SVCB records for 1.1.1.1. (I don't know if clients would ignore them, or actually switch to 1.1.1.1.)
Non-SVCB-type queries for _dns.resolver.arpa return NXDOMAIN instead of NOERROR. (This probably doesn't have significant impact, but might break it for some clients, e.g. if they can be tricked into making queries for _dns.resolver.arpa, or if a downstream resolver makes DS queries.)