T-SQL query is hanging - sql-server

Question

First off, I didn't write this query. It's created dynamically in code I inherited. It works 99.9999% of the time so I'd prefer not to touch it. However. The following query just hangs:
SELECT
*
FROM
(
SELECT TOP 1
Track
, RequestID
, ClientName
, MatterName
, CASE
WHEN PATINDEX('% - Yellow', PhaseName) > 0 THEN REPLACE(PhaseName, ' - Yellow', '')
ELSE PhaseName
END AS PhaseName
, MPApprovalStatusName
, DateOpened
, RequestorName
, Notes
, IsNewClient
, AffiliatedClients
FROM
(
SELECT TOP 15
*
FROM
vwRequests AS T1
WHERE
ClientName LIKE '%harch%'
ORDER BY
DateOpened DESC
) AS T2
ORDER BY
DateOpened ASC
) AS T3
ORDER BY
DateOpened DESC
If I replace "harch" in the LIKE statement with "chameleon" (both should return results), results are returned with no problem. If I change the LIKE '%harch%' to = '(complete client name)', it works. If I leave LIKE, but remove the CASE statement and just output the PhaseName, it works. I experimented and did this:
SELECT TOP 15
*
, PATINDEX('% - Yellow', PhaseName)
FROM
vwRequests AS T1
WHERE
ClientName LIKE '%harch%'
ORDER BY
DateOpened DESC
It works fine. However, when I do this:
SELECT TOP 15
*
, PATINDEX('% - Yellow', PhaseName)
, REPLACE(PhaseName, ' - Yellow', '')
FROM
vwRequests AS T1
WHERE
ClientName LIKE '%harch%'
ORDER BY
DateOpened DESC
it hangs. What's weird about this is that PhaseName in this case is "Completed." Why would the REPLACE statement cause a problem? And why would LIKE be problematic in this case but not others? I'm on SQL Server 2017. Thanks in advance.