I have seen this issue on my Flexys as well, and I use a standard script for all of them. I think it is just a bug on the visualization on the webapp. If you go back to any other option on the menu, then open the BASIC IDE again, you should see it appear without a problem.
You need to be careful about your actions when the script doesnāt appear, because if you stop the code and then ārunā it again, it will delete the script and run an empty script. Iāve seen that happen.
I think HMS needs to work on the refreshing of their screens a little bit, since Iāve seen it happening also on the VALUE screen. After I define over 500 - 600 tags, they stop appearing on the screen, even though they are being collected properly.
In the meantime just be patient, jump to another screen then back to the IDE, and you should be fine. I hope this helped!
Regards,
-R