I have had a similar issue with word crashing when trying to save a new document and also excel will not save correctly, did not crash but always saves a book1 and then does not save and you cant browse to documents (network redirect - home drive).
Seems to be a mixture of redirecting to read only desktop and a mandatory profile. As it only affects pupils not staff. staff have roaming profiles, pupils mandatory. Works fine in window 7 but issue started in window 10. Does it with office 2016 or 2019. if you remove redirect desktop it word never crashes. Still trying to get a better solution.