Certain applications have unusual behavior on taskbar?

Not sure if this is actually a bug or not, so I'm asking what I did wrong instead.

First application I'm talking about is Twine, from the website: https://twinery.org/
For some reason even though it has a unique icon when I open it, it reverts into a generic sheet of paper icon when it is closed while pinned onto the taskbar.

Second application is Grayjay, from the website: https://grayjay.app/desktop/
Installed version is the Linux x64 one. This cannot be pinned to the taskbar and I can't find out why, the option is greyed out. Both of these applications also did not need to be installed into Bazzite, I unzipped a folder from them and clicked on their executable to open them.
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