Hi,
I triggered a regression bug when upgrading VUnit to v4.2.0 from v4.0.8.
With git bisect I found the offinding commit 3e098f5, merged in #429 .

When using the axi-stream slave, the ready signal starts toggling.

Same issue is in the axi_stream_slave, although the tests are passing, just need approximately twice as long. The offending line is https://github.com/VUnit/vunit/blob/master/vunit/vhdl/verification_components/src/axi_stream_slave.vhd#L95, however I haven't digged deep enough to find out why this change was made.