Upon further testing, this seems to be an Adobe issue.
Examining even the photos with lens types from Pentax that DO work, I see that before they are imported into Lr they have NO lens model tag. None.
But once imported into Lr, these lenses are identified in the exif panel, in filters, and by Lens Corrections if they match an existing Adobe lens profile. But the lenses that don't, will not.
Additionally, after a metadata save or other manipulation with an autosave in Lr the lens info is apparently written to the Lens Model tag by Lr when it saves the file. If it matches the profile. So the lens model tag is generated by Adobe, not the camera.
Checking the profiles themselves for my DA-L WR lenses I see models for DA WR (no L) and for DA-L (no WR). The profiles are the same optically (WR means water resistant; L means budget with no focus quick shift, both shouldn't affect the profile). So I need a DA-L WR.
Help me Adobe.
Contacted Adobe by chat. They'll say they'll fix it in future updates. Aargh.
Meanwhile, these three lenses are missing correction profiles and lens info in a filter field:
'7 201' = smc Pentax-DA L 50-200mm F4-5.6 ED WR '7 202' = smc PENTAX-DA L 18-55mm F3.5-5.6 AL WR '7 203' = HD PENTAX-DA 55-300mm F4-5.8 ED WR
The numbers refer to the Lens ID, and these are taken from exif info for Pentax lenses.