Poison Wait Detected: CMEMTHREAD & NUMA - despite enabling trace flag 8048 already

Running sp_Blitz and am seeing Poison Wait Detected: CMEMTHREAD & NUMA and 0:19:10:44 of this wait have been recorded despite enabling trace flag 8048 already.

Running SQL Server 2014 SP2 in a three node cluster, AlwaysOn AG. 40 Logical Processors, 512GB Memmory.

Got this error a few weeks ago and enabled Trace Flag 8048 but still get the Wait. Can anyone please.

Running the following query

SELECT
    type
   ,pages_in_bytes
   ,CASE
        WHEN (0x20 = creation_options & 0x20) THEN 'Global PMO. Cannot be partitioned by CPU/NUMA Node. TF 8048 not applicable.'
        WHEN (0x40 = creation_options & 0x40) THEN 'Partitioned by CPU.TF 8048 not applicable.'
        WHEN (0x80 = creation_options & 0x80) THEN 'Partitioned by Node. Use TF 8048 to further partition by CPU'
        ELSE 'UNKNOWN'
    END
FROM sys.dm_os_memory_objects
ORDER BY pages_in_bytes DESC

Returns mainly Unkown or Partitioned by CPU.TF 8048 not applicable.

Can anyone please suggest how to troubleshoot further ?