I have a theory that something is deleting the .t directory
or it doesn't get made in the location tried.
The last test showed:
add: ("recordedInodeCache",Key {keyName = "e394a389d787383843decc5d3d99b6d184ffa5fddeec23b911f9ee7fc8b9ea77", keyBackendName = "SHA256E", keySize = Just 20, keyMtime = Nothing, keyChunkSize = Nothing, keyChunkNum = Nothing},"start")
("recordedInodeCache",Key {keyName = "e394a389d787383843decc5d3d99b6d184ffa5fddeec23b911f9ee7fc8b9ea77", keyBackendName = "SHA256E", keySize = Just 20, keyMtime = Nothing, keyChunkSize = Nothing, keyChunkNum = Nothing},"end")
("writeInodeCache",Key {keyName = "e394a389d787383843decc5d3d99b6d184ffa5fddeec23b911f9ee7fc8b9ea77", keyBackendName = "SHA256E", keySize = Just 20, keyMtime = Nothing, keyChunkSize = Nothing, keyChunkNum = Nothing},"start")
git-annex: c:\jenkins\workspace\msysgit-git-annex-assistant-test\git-annex\.t\repo\.git\annex\objects\6cd\e82\SHA256E-s20--e394a389d787383843decc5d3d99b6d184ffa5fddeec23b911f9ee7fc8b9ea77\SHA256E-s20--e394a389d787383843decc5d3d99b6d184ffa5fddeec23b911f9ee7fc8b9ea77.cache: openFile: does not exist (No such file or directory)
FAIL
add failed
So writeInodeCache is what's failing, and it seems to fail to write the file
despite having made the parent directory.