How to get rid of warnings about deleted BATS files?

The output is spammed with multiple warnings like:

`bashcov: warning: /tmp/bats-run-gmA9pG/4-urlencode.bats.src was executed but has been deleted since then - it won't be reported in coverage.
`

I've tried different filters like, e.g. `add_filter '/tmp/'`, ` add_filter '/bats-run-' ` or `add_filter %r{^/tmp/bats-run-.*}` but they don't seem to affect the warnings