Using multiple valid wildcard filters not returning results

[drl-max]

Elasticsearch version (bin/elasticsearch --version):
Docker image: docker.elastic.co/elasticsearch/elasticsearch:7.7.1
Plugins installed: []
Whatever comes with the Docker image
JVM version (java -version):
Whatever comes with the Docker image
OS version (uname -a if on a Unix-like system):
Whatever comes with the Docker image
Description of the problem including expected versus actual behavior:
The documentation for the _cat/templates API states that it supports using a comma-separated list of wildcard filters, but I'm finding that it's not working. In fact, it appears to guarantee zero results regardless of the filters validity.

I've experienced the same behavior using the NPM module and the dev console in Kibana 7.7.1. My provided example uses the _cat/templates endpoint, but I've had the same issue with _cat/indices and _cat/aliases too.
Steps to reproduce:
Create some templates:

PUT _template/tmpl1-aoeu
{ "index_patterns": ["ignore"] }

PUT _template/tmpl2-ueoa
{ "index_patterns": ["ignore"] }

Using one wildcard filter returns both templates

GET _cat/templates/tmpl*?v

=> 

name       index_patterns order version
tmpl1-aoeu [ignore]       0     
tmpl2-ueoa [ignore]       0     

Using multiple valid wildcard filters returns nothing

GET _cat/templates/tmpl1-*,tmpl2-*?v

=>

name index_patterns order version

Even something vacuous has the same result

GET _cat/templates/*,*?v

=>

name index_patterns order version

[elasticmachine]

Pinging @elastic/es-core-features (Team:Core/Features)

[joegallo]

Tangentially related to #65667