I’ve seen similar resin/glue in the TRD filters as well. And before anyone questions origin, these were directly ordered and picked up from a Toyota dealer.
Google the part number, there's plenty places still selling it. I've noticed a couple part websites that use a particular backend (Southern States Toyota) are showing NLA for parts that are definitely still available. I had a website tell me I couldn't order a serpentine belt for a 5.7...
When you play with part numbers and Toyota part websites, you start to realize there are inconsistencies even between sites that seem to offer the same catalog through the same software/backend. 🤷♀️
For the TRD filter in question:
McGeorge Toyota
Local Toyota dealer part website (Modern...