Ah. I have that shit disabled. I see that as a security risk having a searchable clipboard history.
I think this requires a clipboard app, doesn't it? Something has to keep all the history saved somewhere.
Gboard does it. https://nostrcheck.me/media/3f770d65d3a764a9c5cb503ae123e62ec7598ad035d836e2a810f3877a745b24/20b55e4abeae4a31d17e90d263e2aa9d0b1f7fca15e228c11664ddba06209493.webp
I don't know where does it come from. Whether it's app feature, os feature, or the hardware keyboard.
But I have clipboard on this device in the other apps.