I really wish the College Board would be more explicit with the teacher instructions because a lot is definitely open to interpretation. I don't see this as a technical problem because I read that to mean something technology related that is preventing the student from completing the work, like problems accessing the CB website or instruction is needed in how to capture video. Although, it is arguable that under the guideline of "Teachers may continue whole class teaching of course content and skills during non-designated time to complete the performance task", you would be able to teach the class about floating point precision errors and how to avoid them.
The answer to the question is unclear to me but I would err on the safe side and explain that there is nothing in the grading guidelines that takes off points for code that doesn't work as expected. It's unfortunate that perhaps the best thing to do is to recommend submitting buggy code but that's all that I can assume that we're supposed to do.