Historically there are two Indic layout systems that OpenType supports, with the second version, which everyone should be using now, introduced 15 years ago in 2008. Fonts can contain data for both at the same time. The fonts I received confirmed my suspicion that it’s the fonts that only support the first version and not the second that stopped working (i.e. they contain deva script tag but not dev2). That feels like a deliberate decision to drop support for the old Indic shaping and if I had to guess I would start with macOS here.