It does not replace pseudo parameters in the split stack files.
Why wait until before:deploy:deploy to replace? can we get it to be much early. Looking at split stacks, it starts at 'after:aws:package:finalize:mergeCustomProviderResources'. So was thinking if there is a stage before that where pseudo parameter replacement can take place? like 'before:aws:package:finalize:mergeCustomProviderResources'.