Prior to 2.4 only one source is permitted for ec2_group rules/rules_egress. 2.4 and after a list of sources is accepted. (#25165)

lib/ansible/modules/cloud/amazon/ec2_group.py

@@ -46,11 +46,14 @@ options:
       - List of firewall inbound rules to enforce in this group (see example). If none are supplied,
         no inbound rules will be enabled. Rules list may include its own name in `group_name`.
         This allows idempotent loopback additions (e.g. allow group to acccess itself).
+        Rule sources list support was added in version 2.4. This allows to define multiple sources per
+        source type as well as multiple source types per rule. Prior to 2.4 an individual source is allowed.
     required: false
   rules_egress:
     description:
       - List of firewall outbound rules to enforce in this group (see example). If none are supplied,
         a default all-out rule is assumed. If an empty list is supplied, no outbound rules will be enabled.
+        Rule Egress sources list support was added in version 2.4.
     required: false
     version_added: "1.6"
   state: