I have been working with adobe premiere pro for over 6 years and I never had this issue before. V15.0 of adobe premiere pro 2021 has issue when I import an arabic SRT file. The letters of all the arabic subtitles are split and not joint. (see attached image). What frustrates me is that it is joint in the source view, so why not in the sequence view???
"Do you have South Asian and Middle Eastern set in your Caption Track Settings? Right-click on the Caption track header, choose Track Settings... and then under Styling Options > Text Engine, click button for South Asian and Middle Eastern. Then click Ok button."
Interestingly, I don't think you need to set the regular preferences to South Asian and Middle Eastern as long as you set the caption track. But when I set the regular preferences to that and created a new track, it set the caption track to the same.