The problem is that Apple had completely ended support of all QuickTime 7-era codecs several years ago. And it's not just Premiere Pro that must end all support for the codecs that your content uses; everybody must also discontinue support for them. These codecs are NOT 64-bit compliant at all. They are strictly 32-bit codecs.
You can try transcoding (with the few third-party software programs that remain that still support those codecs) to a more supported codec, then import those transcodes into Premiere Pro.
Those codecs thay you deem "normal" are now deemed "obsolete" by the entire tech industry.