Pilot Murex Section Sealant?

[RayCornett]

Pilot Murex - I had done some minor repair on this pen for the original owner but have since then acquired it for my own collection.
For the repair I did , a full disassembly was not necessary. I pulled the cap off yesterday and the section came loose with it. This is what I saw. Is this normally adhered to the inside of the section like an inner cap in a pen cap? I don't seem to be finding pictures of such a part over the feed as of yet.CameraZOOM-20200224035542342.jpg