I have referred the missing WHLZ-LD 19.x channels to Gracenote
The pinned topic does have a screenshot showing where you can see the Lineup name in DVR Settings Reporting Plex DVR Lineup Inaccuracies
In your case - the lineup name is “Local Broadcast Listings”
I need more details - screenshots for each 27.x and 49.x set showing which channels you are receiving and with what callsigns
Looking up RabbitEars.Info for Harrisburg market does not show the channel numbers you mention