Test timings can't be found

I’ve just tried stripping off the ./ using sed -i 's/\.\///g' ./coverage/xml/rspec/rspec.xml and still get the “No timing found” messages all over the place. I’m running RSpec using:

TESTFILES=$(circleci tests glob "./spec/**/*_spec.rb" | circleci tests split --split-by=timings --timings-type=classname)
bundle exec rspec \
  --format RspecJunitFormatter \
  --out ./coverage/xml/rspec/rspec.xml \
  --format progress \
  -- $TESTFILES