REF_PATTERN not working as expected

[krinklesaurus]

This REF_PATTERN only matches ref names which have pull-request/* as the PR's branch name.
The pattern is used after running git show-ref for filtering the refs' names.

Current git show-ref output for this repo is

cc805eaa642b857cd3fc23ec255a925179430b90 refs/heads/master
cc805eaa642b857cd3fc23ec255a925179430b90 refs/remotes/origin/HEAD
992a0a4e1786a255afd294e6b5ba8b70d45e4126 refs/remotes/origin/dependabot/maven/com.fasterxml.jackson.core-jackson-databind-2.9.10.8
9187aceb7dd7f92bd88d3c91fea387fc5647931f refs/remotes/origin/dependabot/maven/com.google.code.gson-gson-2.8.9
a60ee51299aed71b9542512f2baf1061f32ffa21 refs/remotes/origin/handle-check-connection
cc805eaa642b857cd3fc23ec255a925179430b90 refs/remotes/origin/master
70027ff38cabc170f3c39cd7020162730e8ea3b9 refs/tags/1.1
8ec789d1b307294acef65c86a03f1923cc34aa26 refs/tags/1.2
415aa4cfef852130766ff30784cf63ac075b40cc refs/tags/1.4.0-RC
ae120c7d68bc4c7b53be7faa7e049bbd2a61cde3 refs/tags/v0.0.1
1886a9523ed97921dbfb48b48b004bcb9f2aed77 refs/tags/v0.0.2
edb024be42a39940364601900b716e82f060cb58 refs/tags/v0.0.3
6112b196682b03f848025e4176941ed10b1056b6 refs/tags/v0.0.4
e8a42fbd535b457e596d1b659e69df5a534e9c68 refs/tags/v1.0
8e473e571be892c25f81e76fc86bab7b325e2b00 refs/tags/v1.2.1
03f7721d40492b7735f59156af9038d4e6dd49b6 refs/tags/v1.2.2
a20639ca476256302e92d56ecc1838f0cf1c6e56 refs/tags/v1.2.3
e37a1954a91f059a5f8f8755884c3ef7e2407218 refs/tags/v1.2.4
89c222bd441bd7cee02bfe3d5fd35a9d4926a8d0 refs/tags/v1.3.0
d337eaa6b33afcc23fa3e44a86fdf0d99f0c136f refs/tags/v1.3.0-RC1
b28c1950ca163f2c7fcf673367c2b36c55bd4e4e refs/tags/v1.3.0-RC2
61f4fe57d60bdec22978f9fa196a87876b27cfa3 refs/tags/v1.3.1
573f12fc9d0b8cf8a14af6ea175346583699a03a refs/tags/v1.3.2
ddf88d5fba91c7ed1ff6c002763cfa8f0fab6255 refs/tags/v1.3.3
ee34d4be766602858031ba23109b4dba9feccb6c refs/tags/v1.3.4
492af8c01a9a65b1480a315d8f9105f7406799e8 refs/tags/v1.3.5
4834322cef963c345560b4671ee149f0e7408e07 refs/tags/v1.4.0-RC2
f06bdcb15c8ae4bda6bff4640b94799c47027eac refs/tags/v1.4.0-RC3
111a547a26402bc0c57e4d7745acf9d4a531ddea refs/tags/v1.4.0-RC4

and none of the PR branches matches the pattern refs/remotes/origin/pull-request/ that is used here to resolve the branchToRevisionMap map.