I'm adding another comment and eating humble pie because I found out this evening that the Samsung keyboard application saves up to 100 items in the Samsung Keyboard clipboard in plain text, with no way to set any kind of auto clear and it does this no matter what other keyboards you install and use. For example, you can install gBoard (Google Keyboard) and set it as the default keyboard, copy something to the clipboard, and it will be there in your Samsung keyboard regardless of whether you set gBoard to auto clear the clipboard every hour. The only way to completely clear the clipboard is via manually pressing five buttons: first the clipboard button followed by the trash can icon, followed by select all, followed by delete, then confirm. This is obviously a massive security risk if you are using a 3rd party password manager and, despite lots of requests for many years, Samsung have declined to do anything about it.
Thankfully, it does look like you can uninstall these packages and most of the other Samsung bloatware using adb or the Universal Android Debloater[1] but it is still some of the most exceptionally disgusting behaviour I've ever seen from a major tech company and I hope that either the EU or some other governing body forces them to fix it or Google bakes something into Android that makes it impossible for them to do. Either way, I will be jumping ship to a more trustworthy brand as soon there is one that has an adequate desktop mode with Quadlock case support.