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When multiple repositories provide different version of the same stream, default stream is lost, 

"dnf module list foo" don't have any default stream (with [d])

Use case

* AppStream providing php 7.2 (default stream = 7.2)
* CentOS Stream providing php 7.3
  (no default stream, as 7.2 from AppStream expected)

Other use case

* AppStream providing php 7.2 and 7.3
* remi-modular providing remi-7.2, remi-7.3, remi-7.4


Fixed uppstream, see 
See https://github.com/fedora-modularity/libmodulemd/issues/381
https://github.com/fedora-modularity/libmodulemd/pull/379

As Remi notes, this is fixed upstream. This will be a serious issue for anyone managing a third-party repository providing modules (such as Remi's Repo and EPEL), so I'd call this a very high priority to fix in RHEL.

*** Bug 1755148 has been marked as a duplicate of this bug. ***

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHEA-2020:1790