When multiple TAP files with same basename match pattern, only one is processed

When multiple TAP files with same filename match pattern, only one is processed.

Given the pattern:

test/regression/output/**/testresult.tap

with files test/regression/output/A/testresult.tap and test/regression/output/B/testresult.tap existing in the workspace, only one of them is processed. This used to work without problems in the past.

The issue seems to be related to both matches having the same basename, because the following works:

test/regression/output/**/*-testresult.tap

matches and processes both test/regression/output/A/A-testresult.tap and test/regression/output/B/B-testresult.tap