Since the start of Covid, 'data' has been referred to as a plural, strangely, after decades of everyone getting it wrong...
'Referenda' seems to have vanished now, thank heaven, replaced by 'referendums', but remember that we are often not the arbiters of good usage:
in US supermarkets one till/checkout is labelled '15 items or fewer', quite correctly, instead of using 'less',
and it can easily be argued that 'math' is the correct abbreviation of 'mathematics', and not 'maths'.....