svn log -r based on a start date suddenly no longer returns any revisions

Hi, I have an issue with a subversion repository that suddenly, between 2 attempts roughly an hour or so apart, returns an empty xml list for the following command: D:\vcrs\svn\Collabnet\bin\svn log -r {2008-01-01T00:00:00}:{2019-02-20T10:21:03} --username username --password password http://

Aw: svn log -r based on a start date suddenly no longer returns any revisions

> svn log -r {2008-01-01T00:00:00}:{2019-02-20T10:21:03} [...] http://[...] > --xml -v > [..]  > It should find exactly 2 commits in this range Check if all revisions (0:HEAD) on the root of the repository (not just trunk) are strictly monotonic increasing. If they are not, this can cause this